Tuesday, April 30, 2013

Retirement expert: Medicare already means-tested

Retirement expert: Medicare already means-tested [ Back to EurekAlert! ] Public release date: 29-Apr-2013
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Contact: Phil Ciciora
pciciora@illinois.edu
217-333-2177
University of Illinois at Urbana-Champaign

CHAMPAIGN, Ill. The Obama administration's controversial proposal to "means-test" Medicare recipients is ostensibly aimed at generating more cash for the government from those who can afford it or squeezing more money out of upper-income seniors, depending upon one's point of view. But according to a University of Illinois expert on retirement benefits, the Medicare program is already means-tested.

Law professor Richard L. Kaplan says whenever the issue of cutting Medicare emerges, one of the first ideas to "fix" the program is to make its upper-income beneficiaries pay more.

"Indeed, the claim is often advanced that it is silly if not offensive to have low-income workers pay higher taxes so that wealthy beneficiaries can receive subsidized benefits from the Medicare program," said Kaplan, the Peer and Sarah Pedersen Professor at Illinois. "But the underlying premise is that Medicare is not already means-tested, and that is simply not the case."

Medicare Part A is financed by a 2.9 percent payroll tax imposed on all wages, salaries and income from self-employment, so higher-earning people already pay more for their Part A benefits. Starting this year, individuals with annual earnings above $200,000 and married couples with annual earnings above $250,000 will owe an additional 0.9 percent in Medicare tax, according to Kaplan.

Those taxpayers also will owe a 3.8 percent Medicare tax on their investment income in excess of those same thresholds.

Medicare Part B and Part D employ a more direct form of means-testing namely, increased premiums based on taxable income during one's retirement years, Kaplan said.

"Eschewing the precise mechanics of the applicable provisions, any Medicare beneficiary whose income exceeds an annually determined threshold pays an increased amount for coverage under these components of Medicare," Kaplan said.

"Thus, once taxable income with certain adjustments reaches the specified threshold, the amount paid by enrollees in either Medicare Part B or Medicare Part D is increased according to a four-step rate schedule."

Moreover, the formula was made more severe when the health care reform legislation enacted in 2010 froze the applicable income thresholds for the next 10 years, Kaplan said.

"Those thresholds are not indexed for inflation and will therefore affect more people over time," he said. "Furthermore, the Obama administration has proposed adding additional brackets a total of nine brackets versus the four we have now so that charges rise faster as income goes up."

Kaplan said that unlike Social Security benefits, which bear a close relationship to one's pre-retirement earnings, there is no correlation between one's pre-retirement earnings and the benefits a person receives from Medicare Part A.

"The value of Medicare benefits received correlates with a person's health, not wealth, so a less-healthy retiree will receive more from Medicare than a healthier retiree," he said. "To the extent that wealthy retirees are healthier than their poorer counterparts, there is an inverse relationship between income prior to retirement and benefits received from the Medicare program."

According to Kaplan, some policymakers oppose the very concept of means-testing benefits, regardless of the specific formula employed, arguing that Medicare is a social insurance program and should provide equal benefits to all participants regardless of their individual resources.

"Means-testing benefits, in their view, risks converting Medicare into another welfare-oriented program, with the possible erosion of popular support and potential exposure to the sort of reductions that such programs often suffer in difficult economic times," Kaplan said. "Other policymakers oppose means-testing Medicare because they regard reducing promised benefits on the basis of income as a disguised tax, a penalty on 'success,' in their view."

Thus, the idea that Medicare benefits should be means-tested raises genuine philosophical issues and is not a policy "slam dunk."

"The bottom line is that the individual components of Medicare are means-tested currently," Kaplan said. "Some lawmakers, no doubt, might prefer that the degree to which Medicare is means-tested be increased, but the fact remains that Medicare is already means-tested."

Kaplan's paper, "Top Ten Myths of Medicare," was published in The Elder Law Journal.

###

Editor's notes: To contact Richard L. Kaplan, call 217-333-2499; email rkaplan@illinois.edu. The article, "Top Ten Myths of Medicare," is available online.


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Retirement expert: Medicare already means-tested [ Back to EurekAlert! ] Public release date: 29-Apr-2013
[ | E-mail | Share Share ]

Contact: Phil Ciciora
pciciora@illinois.edu
217-333-2177
University of Illinois at Urbana-Champaign

CHAMPAIGN, Ill. The Obama administration's controversial proposal to "means-test" Medicare recipients is ostensibly aimed at generating more cash for the government from those who can afford it or squeezing more money out of upper-income seniors, depending upon one's point of view. But according to a University of Illinois expert on retirement benefits, the Medicare program is already means-tested.

Law professor Richard L. Kaplan says whenever the issue of cutting Medicare emerges, one of the first ideas to "fix" the program is to make its upper-income beneficiaries pay more.

"Indeed, the claim is often advanced that it is silly if not offensive to have low-income workers pay higher taxes so that wealthy beneficiaries can receive subsidized benefits from the Medicare program," said Kaplan, the Peer and Sarah Pedersen Professor at Illinois. "But the underlying premise is that Medicare is not already means-tested, and that is simply not the case."

Medicare Part A is financed by a 2.9 percent payroll tax imposed on all wages, salaries and income from self-employment, so higher-earning people already pay more for their Part A benefits. Starting this year, individuals with annual earnings above $200,000 and married couples with annual earnings above $250,000 will owe an additional 0.9 percent in Medicare tax, according to Kaplan.

Those taxpayers also will owe a 3.8 percent Medicare tax on their investment income in excess of those same thresholds.

Medicare Part B and Part D employ a more direct form of means-testing namely, increased premiums based on taxable income during one's retirement years, Kaplan said.

"Eschewing the precise mechanics of the applicable provisions, any Medicare beneficiary whose income exceeds an annually determined threshold pays an increased amount for coverage under these components of Medicare," Kaplan said.

"Thus, once taxable income with certain adjustments reaches the specified threshold, the amount paid by enrollees in either Medicare Part B or Medicare Part D is increased according to a four-step rate schedule."

Moreover, the formula was made more severe when the health care reform legislation enacted in 2010 froze the applicable income thresholds for the next 10 years, Kaplan said.

"Those thresholds are not indexed for inflation and will therefore affect more people over time," he said. "Furthermore, the Obama administration has proposed adding additional brackets a total of nine brackets versus the four we have now so that charges rise faster as income goes up."

Kaplan said that unlike Social Security benefits, which bear a close relationship to one's pre-retirement earnings, there is no correlation between one's pre-retirement earnings and the benefits a person receives from Medicare Part A.

"The value of Medicare benefits received correlates with a person's health, not wealth, so a less-healthy retiree will receive more from Medicare than a healthier retiree," he said. "To the extent that wealthy retirees are healthier than their poorer counterparts, there is an inverse relationship between income prior to retirement and benefits received from the Medicare program."

According to Kaplan, some policymakers oppose the very concept of means-testing benefits, regardless of the specific formula employed, arguing that Medicare is a social insurance program and should provide equal benefits to all participants regardless of their individual resources.

"Means-testing benefits, in their view, risks converting Medicare into another welfare-oriented program, with the possible erosion of popular support and potential exposure to the sort of reductions that such programs often suffer in difficult economic times," Kaplan said. "Other policymakers oppose means-testing Medicare because they regard reducing promised benefits on the basis of income as a disguised tax, a penalty on 'success,' in their view."

Thus, the idea that Medicare benefits should be means-tested raises genuine philosophical issues and is not a policy "slam dunk."

"The bottom line is that the individual components of Medicare are means-tested currently," Kaplan said. "Some lawmakers, no doubt, might prefer that the degree to which Medicare is means-tested be increased, but the fact remains that Medicare is already means-tested."

Kaplan's paper, "Top Ten Myths of Medicare," was published in The Elder Law Journal.

###

Editor's notes: To contact Richard L. Kaplan, call 217-333-2499; email rkaplan@illinois.edu. The article, "Top Ten Myths of Medicare," is available online.


[ Back to EurekAlert! ] [ | E-mail | Share Share ]

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AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.


Source: http://www.eurekalert.org/pub_releases/2013-04/uoia-rem042913.php

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Putin, Obama speak again amid probe into Tamerlan Tsarnaev

The wider ripple effects of the Boston Marathon bombings are showing up in US-Russia relations.

Presidents Vladimir Putin and Barack Obama talked by phone Monday, and they agreed to maintain close contact between their respective intelligence agencies and to work together on security matters of joint concern including the 2014 Olympics that Russia is hosting in Sochi.

Relations between the two nations have been strained of late, but the naming of two brothers of Chechen heritage as the key suspects in the April 15 Boston bombings, the Monitor reported earlier Monday, have opened the door to possible improvement, at least on the issue of countering terrorist threats.

But the forward-looking cooperation is occurring as some big questions remain about who knew what, and when, about the radicalization of Tamerlan Tsarnaev. The FBI identified him as a key suspect in the attacks, and he died April 19 after a gun battle with police, during which his brother also ran over him while trying to escape in a hijacked car.

RECOMMENDED: Boston bombing reveals a new American maturity toward insecurity

US officials have said Russia in 2011 raised concerns with the FBI and CIA, separately, about possible ties of Mr. Tsarnaev to radical Islamist views. That has raised questions about the effectiveness of US law enforcement agencies at screening for potential terrorist threats.

Here are other recent developments in the Boston Marathon bombings case:

Want your top political issues explained? Get customized DC Decoder updates.

?FBI agents have visited the Rhode Island home of Tamerlan Tsarnaev's in-laws and carried away several bags, the Associated Press reported Monday. Katherine Russell, Tsarnaev's widow, has been staying there. She left with her attorneys through a separate door.

?Dzhokhar Tsarnaev, the other bombing suspect and Tamerlan?s 19-year-old brother, has been moved from a Boston hospital to a prison medical center outside the city. Whereas Tamerlan was in the US on a green card, Dzhokhar is a US citizen. Prosecutors are charging him with using a weapon of mass destruction ? the two marathon-day bombs that killed three people and injured more than 200.

?The brothers? parents, who are now in Russia but who lived in the US for much of the past decade, have backed off from any plans to travel to the US. Anzor Tsarnaev, the father, said that he believed he would not be allowed to see his surviving son, and that he is not feeling well, according to wire service reports. The body of his older son is unclaimed, and a spokesman for the state medical examiner told Reuters that the office is waiting to report autopsy results until someone claims the body.

?According to news reports over the weekend, Tamerlan Tsarnaev spoke to his mother, Zubeidat Tsarnaeva, about "jihad" in a 2011 phone call secretly recorded by Russian officials.

On Sunday Rep. Michael McCaul, chairman of the House Homeland Security Committee, said he believes that the bombing suspects? mother played a "very strong role" in her sons' radicalization process. But the motives behind the attacks remain a matter on which investigators are still piecing together the full story.

RECOMMENDED: Boston bombing reveals a new American maturity toward insecurity

Related stories

Read this story at csmonitor.com

Become a part of the Monitor community

Source: http://news.yahoo.com/putin-obama-speak-again-amid-probe-tamerlan-tsarnaev-002747257.html

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Monday, April 29, 2013

Google Now comes to iPhone, challenging Apple's Siri

By Alexei Oreskovic

SAN FRANCISCO (Reuters) - Google Inc is bringing its Google Now technology to the iPhone, where it will compete head-on with Apple Inc's Siri to serve as the primary service that smartphone users rely on to get everything from weather updates to traffic forecasts.

Google Now, which made its debut last year on mobile devices powered by Google's Android operating system, will be available as a feature in the new version of the Google Search app for iPhones and iPads starting on Monday.

Personal assistant technology such as Apple's Siri, Google Now and products created by various start-up companies aspire to play what could become a critical role on smartphones by helping users with daily chores such as looking up information on the Web, handling calendar appointments and managing travel plans.

Some analysts believe Apple's Siri, which comes pre-loaded on iPhones and iPads, represents a growing threat to Google, the world's No. 1 search engine. The information that Siri provides on common topics such as sports scores and nearby restaurants reduces the need to visit Google's search engine, the analysts say.

Johanna Wright, Google's vice president of Search and Assist for Mobile, described Google Now as the next phase in the evolution of search, in which answers are served up without a user needing to type in a query.

The technology taps into Google's various online services, from Web search to personal Gmail email and Google Calendar entries, to deliver relevant information throughout the day in pop-up windows that Google refers to as "cards." By accessing an email with a flight itinerary, for example, Google Now can automatically remind a traveler about an upcoming trip and suggest the best time to leave for the airport based on current traffic conditions.

Unlike the Android version of Google Now, in which users can swipe the phone's homescreen to quickly access the pop-up cards, the version for Apple's iOS will only display these cards when a user has opened the Google Search app.

The smartphone has emerged as a key battleground between Google and Apple as consumers increasingly access the Web with mobile devices instead of personal computers.

In September, Apple replaced the Google Maps app that once came pre-loaded on iPhones with a new maps app that Apple created in-house. The Apple maps service contained embarrassing errors, drawing fierce criticism from consumers and reviewers and forcing Apple Chief Executive Tim Cook to offer a public apology.

(Reporting by Alexei Oreskovic; Editing by Richard Chang)

Source: http://news.yahoo.com/google-now-comes-iphone-challenging-apples-siri-143928576.html

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Nintendo now selling refurbished DSi XL and 3DS units for $100 and up

Nintendo now selling refurbished 3DS and DSi XL

It's easy for us to go shopping for a refurbished Nintendo handheld at stores and auction houses, but not if we're looking for a huge bargain: small discounts and dodgy quality often make it wiser to buy new instead. Nintendo has just offered us some better reasons to scrimp and save by quietly offering both the DSi XL and 3DS through its refurb shop. The used (and occasionally bruised) systems respectively start at $100 and $130, or $30 and $40 less than they'd normally cost -- enough to justify splurging on a game or two. While the selection is currently scarce, we'll set that qualm aside when everything gets the same year-long warranty as a new unit. About the only debate left is whether or not we're looking for a dedicated game machine in the first place.

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Via: Nintendo Everything, Ars Technica

Source: Nintendo

Source: http://feeds.engadget.com/~r/weblogsinc/engadget/~3/P8SRXJZa0Ok/

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Bissau leader pledges election by year end

BISSAU (Reuters) - Guinea-Bissau's interim leader returned home on Sunday after weeks abroad seeking medical treatment and pledged to organize elections in his coup-prone nation before the end of the year.

President Manuel Serifo Nhamadjo refused to comment on this month's U.S. drug sting that targeted his country's top brass, accused of trafficking Latin American cocaine, but said he expected leaders to unite so donors could fund the election.

African and Western diplomats are pinning their hopes on the election drawing a line under decades of instability in the former Portuguese colony, but a U.S. sting operation that targeted the military chief sent shockwaves through the tiny nation.

"Presidential elections will take place this year," Nhamadjo told reporters after he returned from weeks of treatment in Germany for an unspecified medical problem.

"The political parties will come together to set up, as soon as possible, a unity government," he added.

The nation was thrust into its latest crisis last year when the military arrested then Prime Minister Carlos Gomes Junior and acting President Raimundo Pereira in the midst of an election that Gomes Junior was poised to win.

Armed Forces Chief General Antonio Indjai was briefly in power before officially ceding to Nhamadjo.

However, Indjai is still widely seen as the nation's most powerful man and was targeted by, but escaped, the U.S. sting operation that netted the country's former navy chief.

Nhamadjo refused to comment on the sting operation, which has led to authorities during his absence accusing Washington of illegally kidnapping one of the country's citizens.

"I was away from the country ... I was never briefed on this issue while I was away," he said.

Elections were due to be held in May, but in March West African leaders prolonged the mandate of the caretaker government until the end of the year.

(Reporting by Alberto Dabo; Writing by David Lewis; Editing by Jon Hemming)

Source: http://news.yahoo.com/bissau-leader-pledges-election-end-220526676.html

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Key Egyptian negotiator with IMF quits

CAIRO (Reuters) - A key Egyptian negotiator with the International Monetary Fund said on Sunday he has resigned as first deputy finance minister, in a potential blow to Cairo's prospects of an early IMF deal.

Hany Kadry Dimian has been the crucial point man in Egypt's protracted and so far fruitless negotiations to obtain a $4.8 billion loan needed to help combat a severe economic crisis.

"The only comment I can make for the time being is that yes, my term ends on April 30 according to my resignation, which I submitted in December," Kadry told Reuters by telephone.

"My next move is not decided."

A senior technocrat appointed in 2007, Kadry survived five finance ministers in office since the 2011 uprising that overthrew former autocratic President Hosni Mubarak.

Kadry gave no explanation for his decision to quit, first reported on the Egyptian dissident Rebel Economy blog, saying he would say more on Tuesday.

A senior European diplomat said his departure was not a good omen for Egypt's hopes of wrapping up a deal on the long delayed IMF loan next month, as the government has said it aims to do.

Kadry was the one expert in the ministry who fully understood the IMF program and was able to deal with the global lender professionally, the diplomat said.

The daily El-Watan said on its website that Kadry had been under increasing pressure from the ruling Muslim Brotherhood's Freedom and Justice Party, and in conflict with Abdallah Shehata, the FJP economic adviser to Finance Minister Al-Mursi Al-Sayed Hegazy.

Separately, the head of Egypt's bourse, Mohamed Omran, told Prime Minister Hisham Kandil he would like to leave his position at the end of his term on July 1, the state news agency MENA reported, citing an unnamed official stock exchange source.

The report did not give a reason for Omran's request, but said he had told the prime minister in August he wanted to leave the post. Kandil had asked him to stay until the end of his term, MENA said.

(Additional reporting by Alexander Dziadosz; Writing by Paul Taylor; Editing by Jon Hemming)

Source: http://news.yahoo.com/key-egyptian-negotiator-imf-quits-191627035.html

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Friday, April 26, 2013

Xing puts a Wii U at the heart of its costly karaoke machine

DNP This is what near $16,000 Wii U looks like

Sure, we've seen game consoles modified for use beyond their original purpose, but this apparatus turns things up a notch. Pictured above is the Joysound Festa, a mobile entertainment system powered by the Wii U's hardware and software. Built by Japanese karaoke machine maker Xing, this beastly console mod is controlled from the system's Gamepad and includes the gracelessly named Nintendo x Joysound Wii Karaoke U. Pre-loaded with 90,000 songs, this party starter also ships with a set of dance, exercise, yoga and brain training videos. Already reaching for your wallet? You should know that this unique setup is Japan-only, and headed to hotels and nursing homes at a hefty price of 1,580,000 yen (around $15,884). At that price, it may take around 25 years until we see one of these bad boys up for grabs on eBay.

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Via: Kotaku

Source: Joysound Festa (translated)

Source: http://www.engadget.com/2013/04/25/xing-wii-u-karaoke-machine/?utm_medium=feed&utm_source=Feed_Classic&utm_campaign=Engadget

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Steps To Follow While Booking A Mercedes Van Rental

We live in a world where physical things and services of all kinds are available against certain sums of money. Today, if you desire to ride a luxurious car of any make or model, you can do it easily by hiring one from the reliable sources. You would not require buying a car by your own. The presence of the car rental companies has been a boon for the people who wish to enjoy some special moments of their life along with their near and dear ones. The car rental services work with a large number of cars and vans including luxurious ones.
If you are looking for the best services in all types of cars and vans, then you are just required to follow the steps mentioned below:
Plan your trip beforehand:

You must plan your trip beforehand before you rent a sprinter van. The reason behind this planning is simple. Actually, you can go for sprinter van rental only for a few hours, as because it is quite expensive and hiring it for a longer period can be quite expensive. It can be good enough for you to think and decide your budget as well. It can help you to manage your trip according to your budget.
Find a dependable company to rent a sprinter:

Though there are thousands of companies available at the present moment, it is quite difficult to find out the best company that offers the best services and facilities. These companies are known for all types of cars and vans including Mercedes van rental and other luxurious sprinter van rentals. These companies are available everywhere in the USA. If you are located in New York, then you can get the services of the best companies at your place.
Make proper enquiries:

In order to rent a sprinter New York, you must make proper queries before hiring a company to satisfy your needs. You must pay attention towards the services and other offers that these companies are offering to their customers like you. You are free to take your own decision as no one forces you to accept any deal that you do not want or need.
Make the deal final by making the payment:

You can make the deals final only after the terms and conditions are acceptable to you. You must make the payment and demand the receipt along with the contract documents. You must insist on your own planning for the trip. Make your stand clear about the trip and decide not to make any alterations in it unless and until it becomes unavoidable.
Have a prior look at the car or van you have taken on rent:
This is very important thing to remember that you must have a look at the car before you actually ride it. You can even note down the number of the car so that you would find out any cheating in the deal. However, the modern business owners are quite dependable and seldom make any cheating with their customers. You can avoid any unpleasant situation by your attention and willingness to get the best services and facilities from the best companies.?????

About the Author:
People in New York know John Osbourne for his services in Rent a Sprinter vans and cargos. People can rent sprinter van as per their own needs through his website.

Source: http://www.articlesnatch.com/Article/Steps-To-Follow-While-Booking-A-Mercedes-Van-Rental/4569103

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Take a Toxic Tour of Baltimore's Scariest Environmental Problems

glenn-ross-image-01-thumb

Lead in the soil, brownfields, illegal dumping sites, rat infestations ? these aren?t the sorts of thing you?d see on your average city tour, but they?re the highlights of ?urban environmentalist? Glenn Ross?s Toxic Tour of Baltimore. And he makes sure the windows are open. ?I put it right up in their face ? they?ve got to smell it, taste it, the whole nine yards,? he told Andrea Appleton, writing for Grist. ?And at the end of the tour, they get it.?

Believe it or not, we have rats to thank for Ross?s current environmental justice activism:?? ?I started organizing around the rat problem in the area,? he told an interviewer in 2006. ?I joined the neighborhood association, got very active, joined a number of different boards, and I realized that there was a lot going on in this area that residents weren?t aware of. As a new homeowner and a single parent for twenty-six years, I?m the type of guy who needs to know what?s going on in my community. And this is what really started me and got me involved in becoming a community advocate. So when people ask me how I got started I can honestly tell them a rat.?

After taking one of Ross?s bus rides through Baltimore?s urban public health disasters, it?s impossible not to realize that they are concentrated in poor, primarily black neighborhoods ? what amounts to environmental racism, according to Ross. Living in toxic environments often leads to health issues, and the neighborhoods his tour travels through have higher rates of asthma, cancer, and lead poisoning.

Ross?s tours are primarily conducted for local college students, school groups, and churces, with the intent of showing them how environmental destruction wreaks havoc on a very local, very personal level. See that stormwater runoff gushing off roofs and feeding into the Harbor? See that pile of toxic construction scraps? How about that black sludge dripping down storm drains? All these things help contribute to the fact that Baltimoreans in some neighborhood have life expectancies that are up to twenty years longer than their neighbors, Appleton points out.

You can get a sense of Ross?s tours in the YouTube clip below ? toxic smells not included:

Source: http://www.baltimorefishbowl.com/stories/take-a-toxic-tour-of-baltimores-scariest-environmental-problems/

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Geoscientists predict new compounds could change our view of what planets are made of

Apr. 24, 2013 ? A team of researchers led by Artem R. Oganov, a professor of theoretical crystallography in the Department of Geosciences, has made a startling prediction that challenges existing chemical models and current understanding of planetary interiors -- magnesium oxide, a major material in the formation of planets, can exist in several different compositions. The team's findings, "Novel stable compounds in the Mg-O system under high pressure," are published in the online edition of Physical Chemistry Chemical Physics. The existence of these compounds -- which are radically different from traditionally known or expected materials -- could have important implications.

"For decades it was believed that MgO is the only thermodynamically stable magnesium oxide, and it was widely believed to be one of the main materials of the interiors of the Earth and other planets," said Qiang Zhu, the lead author of this paper and a postdoctoral student in the Oganov laboratory.

"We have predicted that two new compounds, MgO2 and Mg3O2, become stable at pressures above one and five million atmospheres, respectively. This not only overturns standard chemical intuition but also implies that planets may be made of totally unexpected materials. We have predicted conditions (pressure, temperature, oxygen fugacity) necessary for stability of these new materials, and some planets, though probably not the Earth, may offer such conditions," added Oganov.

In addition to their general chemical interest, MgO2 and Mg3O2 might be important planet-forming minerals in deep interiors of some planets. Planets with these compounds would most likely be the size of Earth or larger.

The team explained how its paper predicted the structures in detail by analyzing the electronic structure and chemical bonding for these compounds. For example, Mg3O2 is forbidden within "textbook chemistry," where the Mg ions can only have charges "+2," O ions are "-2, and the only allowed compound is MgO. In the "oxygen-deficient" semiconductor Mg3O2, there are strong electronic concentrations in the "empty space" of the structure that play the role of negatively charged ions and stabilize this material. Curiously, magnesium becomes a d-element (i.e. a transition metal) under pressure, and this almost alchemical transformation is responsible for the existence of the "forbidden" compound Mg3O2.

The findings were made using unique methods of structure prediction, developed in the Oganov laboratory. "These methods have led to the discovery of many new phenomena and are used by a number of companies for systematically discovering novel materials on the computer -- a much cheaper route, compared to traditional experimental methods," said Zhu.

"It is known that MgO makes up about 10 percent of the volume of our planet, and on other planets this fraction can be larger. The road is now open for a systematic discovery of new unexpected planet-forming materials," concluded Oganov.

This work is funded by the National Science Foundation and DARPA.

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The above story is reprinted from materials provided by Stony Brook University.

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Journal Reference:

  1. Qiang Zhu, Artem R. Oganov, Andriy O. Lyakhov. Novel stable compounds in the Mg?O system under high pressure. Physical Chemistry Chemical Physics, 2013; DOI: 10.1039/C3CP50678A

Note: If no author is given, the source is cited instead.

Disclaimer: Views expressed in this article do not necessarily reflect those of ScienceDaily or its staff.

Source: http://feeds.sciencedaily.com/~r/sciencedaily/top_news/top_environment/~3/e0dYr5OduAk/130424125444.htm

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Serbia-Kosovo deal clears path to EU accession, but long road remains

The agreement to 'normalize' relations between Serbia and Kosovo, which declared independence from Serbia five years ago, removes a major obstacle to each one's bid to join the EU.

By Andrew MacDowall,?Correspondent / April 25, 2013

Members of the Serbian government attend a session in Belgrade, Serbia, on Monday. The Serbian government approved a potentially landmark agreement to normalize relations with breakaway Kosovo that could end years of tensions and put the Balkan rivals on a path to European Union membership.

Marko Drobnjakovic/AP

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This week?s breakthrough deal between Serbia and the disputed territory of Kosovo moves both closer to European Union membership and a conclusion to one of Europe?s last frozen conflicts. But progress towards EU accession is still fraught with difficulty, as Europe continues to struggle with its economic crisis.

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On Monday, the European Commission, the EU?s executive body, recommended that Brussels start formal negotiations on Serbian accession, after the Serbian government agreed to sign a draft agreement ?normalizing? relations with Kosovo, which it still refuses to recognize.

Kosovo unilaterally declared independence in 2008, nine years after a NATO bombing campaign led to Serbian withdrawal from most of the territory, which the majority of Serbs see as part of their country. The deal allows the ethnic-Albanian-dominated government in Pristina to control all of Kosovo, including the predominantly Serbian north.

?This is not recognition, but it is a big step towards it,? says James Ker-Lindsay, senior research fellow on South East European politics at the London School of Economics. ?You can take the view that the agreement still allows Serbia to maintain the fiction that Kosovo is a province of Serbia, just ruled from Pristina. But eventual acceptance of Kosovo is where Serbia is going with all this.?

'A big step'

The deal came after months of on-off negotiations brokered by the EU. Belgrade agreed to sign after Kosovo made concessions on policing of the north, and on a clause which now states that the two countries must not try to block each other?s EU accession process. The revised wording ? which previously referred to membership of any international institutions ? allows Serbia to continue its opposition to Kosovo joining the UN, a related but separate diplomatic battle that had been a sticking point in the EU talks.

Pristina?s reward for this ? other than the de facto recognition of its sovereignty over the whole territory ? will be a Stabilisation and Association Agreement (SAA) with the EU, considered the first step towards membership.

For Serbia, the prospect of EU talks has particular political, diplomatic, and economic significance. It indicates that the country, considered an international pariah less than 15 years ago, is increasingly being accepted back into the international mainstream.

The fact that the Kosovo deal was signed by a coalition of nationalists and socialists which was decried last year for its far-right past and links to late strongman president Slobodan Milosevic has a Nixon-to-China element to it; an EU deal may boost the government?s standing further before possible snap elections in the autumn.

And for the beleaguered Serbian economy, which re-entered recession last year, concrete steps towards the EU should provide a boost in terms of greater stability, impetus for reform, and future funding.

A long way to go

However, accession is far from an easy process, or a short one. Serbia is not likely to join before the next decade, after painstaking economic, judicial, and administrative restructuring. Serbia?s unhappy recent past ? and the EU's experience of integrating Romania and Bulgaria ? mean that Brussels is likely to be particularly stringent in ensuring that the country meets its standards.

As Dr. Ker-Lindsay points out, it is not even certain that negotiations will start any time soon.

?There is a real possibility that Germany or other countries will say that this is still not good enough, which would have a very harmful effect, and lead to a sense of betrayal in Serbia,? he says.

With the EU faced with record levels of skepticism among its own citizens, and its economies struggling to recover from prolonged crisis, Serbian accession may not seem a priority; it is hardly a vote-winner with EU electorates. And it remains to be seen what sort of EU Serbia would be joining ? in a decade?s time it could be a rather different organization.

But for all the necessary caveats, this week?s agreement could prove a landmark in resolving conflicts in a troubled region.

Source: http://rss.csmonitor.com/~r/feeds/csm/~3/Y4hTvqN63pI/Serbia-Kosovo-deal-clears-path-to-EU-accession-but-long-road-remains

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Did online feud fuel ricin-laced letters?

OXFORD, Miss. (AP) ? The investigation into poisoned letters mailed to President Barack Obama and others has shifted from an Elvis impersonator to his longtime foe, and authorities must now figure out if an online feud between the two men might have escalated into something more sinister.

Paul Kevin Curtis, 45, was released from a north Mississippi jail on Tuesday and charges against him were dropped, nearly a week after authorities charged him with sending ricin-laced letters to the president, Republican U.S. Sen. Roger Wicker of Mississippi and an 80-year-old Lee County, Miss., Justice Court judge, Sadie Holland.

Before Curtis left jail, authorities had already descended on the home of 41-year-old Everett Dutschke in Tupelo, a northeast Mississippi town best known as the birthplace of the King himself. On Wednesday, they searched the site of a Tupelo martial arts studio once operated by Dutschke, who hasn't been arrested or charged.

His attorney, Lori Nail Basham, said Dutschke is "cooperating fully" with investigators and that no arrest warrant had been issued.

Curtis, who performs as Elvis and other celebrities, describes a bizarre, yearslong feud between the two, but Dutschke insists he had nothing to do with the letters. They contained language identical to that found on Curtis' Facebook page and other websites, making him an early suspect.

Federal authorities have not said what led them to drop the charges against Curtis, and his lawyers say they're not sure what new evidence the FBI has found.

After being released from jail Tuesday, Curtis described a long feud between himself and Dutschke, but said he's not sure exactly what started it. It involves the men's time working together, a broken promise to help with a book by Curtis and an acrimonious exchange of emails, according to Curtis.

The two worked together at Curtis' brother's insurance office years ago, Curtis said. He said Dutschke told him he owned a newspaper and showed interest in publishing his book called "Missing Pieces," about what Curtis considers an underground market to sell body parts.

But Dutschke decided not to publish the material, Curtis said, and later began stalking him on the Internet.

For his part, Dutschke said he didn't even know Curtis that well.

"He almost had my sympathy until I found out that he was trying to blame somebody else," Dutschke said Monday. "I've known he was disturbed for a long time. Last time we had any contact with each other was at some point in 2010 when I threatened to sue him for fraud for posting a Mensa certificate that is a lie. He is not a Mensa member. That certificate is a lie."

Curtis acknowledges posting a fake Mensa certificate on Facebook, but says it was an online trap set up for Dutschke because he believed Dutschke was stalking him online. He knew Dutschke also claimed to be a member of the organization for people with high IQs. Dutschke had a Mensa email address during his 2007 legislative campaign.

Dutschke started a campaign to prove him a liar, Curtis said, and allegedly harassed him through emails and social networking.

Curtis said the two agreed to meet at one point to face off in person, but Dutschke didn't show up.

"The last email I got from him, was, 'Come back tomorrow at 7 and the results of you being splattered all over the pavement will be public for the world to see what a blank, blank, blank you are.' And then at that point, I knew I was dealing with a coward," Curtis said.

Hal Neilson, one of the attorneys for Curtis, has said the defense gave authorities a list of people who may have had a reason to hurt Curtis, and that Dutschke's name came up. Efforts to reach Curtis, his lawyers and his brother were unsuccessful on Wednesday.

Both men say they have met Wicker, and they each have a connection to Holland.

Authorities say the letters were mailed April 8, but the one sent to Holland was the only one to make it into the hands of an intended target. Her son, Democratic state Rep. Steve Holland of Plantersville, said his mother did a "smell test" of the envelope and a substance in it irritated her nose. The judge was not sickened by what authorities say was a crude form of the poison, which is derived from castor beans.

Sadie Holland has declined to comment on the case.

She was presiding judge in a case in which Curtis was accused of assaulting a Tupelo attorney in 2003. Holland sentenced Curtis to six months in the county jail. He served only part of the sentence, according to his brother.

Running as a Republican, Dutschke lost a lopsided election to Steve Holland in 2007, and observers say the judge publicly chastised Dutschke at a political rally that year.

Brandon Presley, Mississippi's northern district public service commissioner and a distant cousin of Elvis Presley, attended the 2007 political rally in Verona. He told The Associated Press on Wednesday that he remembers Dutschke giving a "militant" speech with personal and professional attacks Steve Holland.

Presley, also a Democrat, said he doesn't recall details of the speech ? just the tone of it, and the crowd's reaction.

"I just remember everybody's jaw dropping," Presley said.

Dutschke, who ran as a Republican, said his speech included sharp criticism of Steve Holland's record in public office.

Steve Holland said earlier this week that his mother made Dutschke get down on his knees at the 2007 rally and apologize. On Wednesday, he said he was mistaken about her telling Dutschke to kneel.

"She just got up and said 'Sir, you will apologize," Steve Holland said.

Dutschke said Steve Holland exaggerated the incident. Presley said he remembers Sadie Holland chastising Dutschke.

Presley said of Sadie Holland: "I don't believe the woman has an enemy in the world.... I don't know anybody who doesn't love Ms. Sadie Holland, except whoever this fool is who sent the letter. Whoever it is, they ought to be ashamed of themselves, picking on Ms. Sadie."

Dutschke ? who unsuccessfully ran as a Democrat for Lee County election commissioner in 2008 ? told AP on Tuesday that he has no problem with Sadie Holland. "Everybody loves Sadie, including me," he said.

On Wednesday, dozens of investigators were searching at a small retail space where neighboring business owners said Dutschke used to operate a martial arts studio. Officers at the scene wouldn't comment on what they were doing.

Investigators in gas masks, gloves and plastic suits emerged from the business carrying five-gallon buckets full of items covered in large plastic bags. Once outside, others started spraying their protective suits with some sort of mist.

Dutschke was seen outside the studio observing the search.

Dutschke told the AP on Wednesday morning that he and his wife had gone to a friend's house because they didn't feel safe at their home. He didn't immediately respond to messages Wednesday afternoon.

"They ripped everything out of the house," he said, adding: "I haven't slept at all."

____

Wagster Pettus contributed from Jackson, Miss., and Associated Press writers Jeff Amy and Jay Reeves contributed from Tupelo, Miss.

Source: http://news.yahoo.com/mens-yearslong-feud-looms-over-ricin-probe-205602937.html

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Thursday, April 25, 2013

US team speaking to suspects' parents in Russia

MAKHACHKALA, Russia (AP) ? U.S. investigators are in contact with the parents of the two Boston bombing suspects in southern Russia and working with Russian security officials to shed light on the deadly attack, a U.S. Embassy official said Wednesday.

The parents plan to fly to the United States on Thursday, the father was quoted telling the Russian state news agency RIA Novosti.

The U.S. team traveled Tuesday from Moscow to the predominantly Muslim province of Dagestan "because the investigation is ongoing, it's not over," said the official, who spoke on condition of anonymity because he was not authorized to speak to the media. He said the Americans were working with the Russian security services, the FSB. He would not specify how long the Americans planned to stay in Dagestan.

Tamerlan Tsarnaev, 26, and his 19-year-old brother, Dzhokhar Tsarnaev, are accused of setting off the two bombs near the finish line of the Boston Marathon on April 15. The elder brother was later killed in a police standoff.

Investigators are looking into whether Tamerlan Tsarnaev, who spent six months in Russia's Caucasus in 2012, was influenced by the religious extremists who have waged an insurgency against Russian security services in the area for years. The brothers have roots in Dagestan and neighboring Chechnya, but neither spent much time in either place before the family moved to the United States a decade ago.

Their mother, Zubeidat Tsarnaeva, spent from morning to early evening Wednesday inside the FSB building in Makhachkala, the capital of Dagestan, where she was believed to be speaking further to U.S. and Russian investigators.

Heda Saratova, a prominent Chechen rights activist providing support to the distraught mother, said Tsarnaeva first went in for questioning on Tuesday, returning late at night. Saratova said she had no details about the discussions, but Tsarnaeva said they were "cordial."

The father, Anzor Tsarnaev, also was summoned to the FSB headquarters but did not go because he felt ill, Saratova said.

He has said previously that he intended to travel to the U.S. this week to talk to police and seek "justice and the truth." The family has said that he wants to bring Tamerlan Tsarnaev's body back to Russia.

___

AP writer Nataliya Vasilyeva in Moscow contributed to this report.

Associated Press

Source: http://hosted2.ap.org/APDEFAULT/3d281c11a96b4ad082fe88aa0db04305/Article_2013-04-24-Russia-Boston%20Suspects/id-011912a7dac248ef9c18965240adc442

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Lawmakers ask who knew what about bomb suspect

BOSTON (AP) ? Lawmakers are asking tough questions about how the government tracked suspected Boston Marathon bomber Tamerlan Tsarnaev when he traveled to Russia last year, renewing criticism from after the Sept. 11 attacks that failure to share intelligence may have contributed to last week's deadly assault.

Following a closed-door briefing on Capitol Hill with the FBI and other law enforcement officials on Tuesday, Sen. Saxby Chambliss, R-Ga., vice chairman of the Senate Intelligence Committee, said it doesn't appear yet that anyone "dropped the ball." But he said he was asking all the federal agencies for more information about who knew what about the suspect.

"There still seem to be serious problems with sharing information, including critical investigative information ... not only among agencies but also within the same agency in one case," said committee member Sen. Susan Collins, R-Maine.

Lawmakers intensified their scrutiny as funerals were held Tuesday for an 8-year-old boy killed in the bombings and a campus police officer who authorities said was shot by Tsarnaev and his younger brother days later. A memorial service for the officer, 26-year-old Sean Collier, is scheduled for Wednesday. Vice President Joe Biden is expected to speak.

Also Wednesday, Boylston Street, where the blasts occurred, reopened to the public after being closed since the bombings.

While family said that the older Tsarnaev had been influenced by a Muslim convert to follow a strict type of Islam, brother 19-year-old Dzhokhar Tsarnaev remained hospitalized after days of questioning over his role in the attacks. Tamerlan Tsarnaev, 26, was killed in a shootout with police last week.

Conflicting stories appeared to emerge about which agencies knew about Tamerlan Tsarnaev's six-month trip to Russia last year how they handled it. Homeland Security Secretary Janet Napolitano told the Senate Judiciary Committee on immigration legislation that her agency knew about Tsarnaev's journey to his homeland.

But Sen. Lindsey Graham, R-S.C., said the FBI "told me they had no knowledge of him leaving or coming back."

Information-sharing failures between agencies prompted an overhaul of the U.S. intelligence system after the Sept. 11, 2001, terror attacks.

Meanwhile, evidence mounted that Tsarnaev had embraced a radical, anti-American strain of Islam. Family members blamed the influence of a Muslim convert, known only to the family as Misha, for steering him toward a strict type of Islam.

"Somehow, he just took his brain," said Tamerlan's uncle, Ruslan Tsarni of Montgomery Village, Md., who recalled conversations with Tamerlan's worried father about Misha's influence.

Authorities don't believe Tsarnaev or his brother had links to terror groups. However, two U.S. officials said that Tsarnaev frequently looked at extremist websites, including Inspire magazine, an English-language online publication produced by al-Qaida's Yemen affiliate. The magazine has endorsed lone-wolf terror attacks.

Both officials spoke on condition of anonymity because they were not authorized to discuss the investigation publicly.

Eight-year-old Martin Richard, a Boston schoolboy and the youngest of those killed by the blasts, was laid to rest Tuesday after a family-only funeral Mass.

"The outpouring of love and support over the last week has been tremendous," the family said in a statement. "This has been the most difficult week of our lives."

The Richards family said they would hold a public memorial service for Martin in the coming weeks.

Dzhokhar Tsarnaev's condition was upgraded from serious to fair Tuesday as investigators continued building their case against him.

He could face the death penalty after being charged Monday with joining forces with his brother in setting off shrapnel-packed pressure-cooker bombs. Three people were killed and over 260 injured. About 50 were still hospitalized.

Dzhokhar Tsarnaev was captured hiding in a tarp-covered boat in a suburban Boston backyard on Friday.

In Washington, Senate Intelligence Committee member Richard Burr, R-N.C., said after his panel was briefed by federal law enforcement officials that there is "no question" that Tamerlan Tsarnaev was "the dominant force" behind the attacks and that the brothers had apparently been radicalized by material on the Internet rather than by contact with militant groups overseas.

The brothers' parents are from Dagestan, a predominantly Muslim province in Russia's Caucasus, where Islamic militants have waged an insurgency against Russia. A U.S. Embassy official said Wednesday that a team of U.S. investigators has traveled to Dagestan to speak to the parents. The official spoke on condition of anonymity because he was not authorized to speak to the media.

Family members reached in the U.S. and abroad by The Associated Press said Tamerlan was influenced by Misha.

After befriending Misha, Tamerlan gave up boxing, stopped studying music and began opposing the wars in Afghanistan and Iraq, according to family members, who said he turned to websites and literature claiming that the CIA was behind 9/11.

"You could always hear his younger brother and sisters say, 'Tamerlan said this,' and 'Tamerlan said that.' Dzhokhar loved him. He would do whatever Tamerlan would say," recalled Elmirza Khozhugov, the ex-husband of Tamerlan's sister. He spoke by telephone from his home in Almaty, Kazakhstan.

The brothers, who came to the U.S. from Russia a decade ago, were raised in a home that followed Sunni Islam, the religion's largest sect, but were not regulars at the mosque and rarely discussed religion, Khozhugov said.

Then, in 2008 or 2009, Tamerlan met Misha, a heavyset bald man with a reddish beard. Khozhugov didn't know where they met but believed they attended a Boston-area mosque together.

Napolitano said Tuesday that her agency knew of Tamerlan Tsarnaev's trip to Russia. She said that even though the suspect's name was misspelled on a travel document, redundancies in the system allowed his departure to be captured by U.S. authorities in January 2012.

Meanwhile, a U.S. Embassy official said U.S. investigators traveled to southern Russia to speak to the brothers' parents, hoping to learn more about their motives.

In other developments:

? A lawyer for Tamerlan Tsarnaev's wife, Katherine Tsarnaeva, said his client "is doing everything she can to assist with the investigation," although he would not say whether she had spoken with federal authorities. Another lawyer for Tsarnaeva said the 24-year-old deeply mourned the loss of innocent victims in the bombings.

? The Massachusetts state House turned aside a bid by several lawmakers to reinstate the death penalty in certain cases, including the murder of police officers. In a 119-38 vote, the House sent the proposal to a study committee rather than advance it to an up-or-down vote.

? In New Jersey, the sisters of the suspects, Ailina and Bella Tsarnaeva, issued a statement saying they were saddened to "see so many innocent people hurt after such a callous act." Later, in brief remarks to several news outlets, Ailina described her elder brother as a "kind and loving man." She said of both brothers: "I have no idea what got into them" and also that "at the end of the day no one knows the truth."

? Phantom Fireworks of Seabrook, N.H., said Tamerlan Tsarnaev bought 48 mortar shells at the store in February. Company Vice President William Weimer, however, said the amount of gunpowder that could be extracted from the fireworks would not have been enough for the Boston bombs.

? A fund created to benefit the victims of the Boston Marathon attacks has generated $20 million. Mayor Thomas Menino said more than 50,000 donors from across the world have made donations to One Fund Boston.

___

Dozier reported from Washington. Associated Press writers Bridget Murphy and Bob Salsberg in Boston, Lynn Berry in Moscow, and Adam Goldman, Eric Tucker, Matt Apuzzo, and Eileen Sullivan in Washington contributed to this report.

Source: http://news.yahoo.com/lawmakers-ask-knew-bomb-suspect-064344186.html

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Wednesday, April 24, 2013

Microsoft Surface Pro and Surface RT now shipping in more countries

Microsoft Surface Pro and Surface RT now shipping in more countries

Microsoft's Surface Pro and RT are striking out to more far flung corners of the globe. Redmond just announced this morning that its two Windows 8 tablets will be made available to even more markets, with the Surface RT being the first to branch out, shipping on April 25th to Malaysia and then soon after to Mexico, Korea and Thailand by end May / early June. When it finally hits that early summer release window, the Surface RT will be accessible to a total of 29 markets globally. As for its older sibling, the feature-packed Surface Pro, that angular slate's set to expand beyond its current limited availability (U.S., Canada and China) to 19 additional markets across Europe (including the UK), Asia and Oceania by the end of next month. And if you've been searching high and low for a 128GB Surface Pro to no avail, chin up, as Microsoft's taken note of your demand and is working with retailers to keep that model "consistently in stock."

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Comments

Source: Microsoft Surface blog

Source: http://www.engadget.com/2013/04/23/microsoft-surface-pro-and-surface-rt-now-shipping-in-more-countr/?utm_medium=feed&utm_source=Feed_Classic&utm_campaign=Engadget

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High-energy astrophysics puzzle

High-energy astrophysics puzzle [ Back to EurekAlert! ] Public release date: 23-Apr-2013
[ | E-mail | Share Share ]

Contact: Michele Fumagalli
mfumagalli@obs.carnegiescience.edu
626-304-0274
Carnegie Institution

Pasadena, CA. Blazars are the brightest of active galactic nuclei, and many emit very high-energy gamma rays. New observations of a blazar known as PKS 1424+240 show that it is the most-distant known source of very high-energy gamma rays. But its emission spectrum appears highly unusual.

A team including Carnegie's Michele Fumagalli used data from the Hubble Space Telescope to set a lower limit for the blazar's redshift (z ? 0.6035). An object's redshift value is a measurement of how much the wavelength of the light from it that reaches Earth is stretched by the expansion of the Universe. Thus, it reveals the object's age and distance. This blazar's redshift corresponds to a distance of at least 7.4 billion light-years. Their work will be published by The Astrophysical Journal and is available online.

Over such a great distance, a substantial proportion of the gamma rays should be absorbed by the extragalactic background light, but calculations that account for the expected absorption yield an unexpected emission spectrum for the blazar.

"We're seeing an extraordinarily bright source that does not display the characteristic emission expected from a very high-energy blazar," said lead author Amy Furniss, University of California Santa Cruz.

The findings may indicate something new about the emission mechanisms of blazars, the extragalactic background light, or the propagation of gamma-ray photons over long distances. It was not thought that such high-energy gamma-ray sources could be seen at such great distances. The research should allow scientists to better understand cosmological models that predict the extragalactic background light.

The extragalactic background light (EBL) is the diffuse radiation from all stars and galaxies, a dim but pervasive glow that fills the universe. When a high-energy gamma-ray photon collides with a lower-energy EBL photon, they annihilate and create an electron-positron pair. The farther gamma rays have to travel, the more likely they are to be absorbed by this mechanism. This limits the distance to which sources of very high-energy gamma rays can be detected.

Measuring the EBL directly is extremely difficult because there are so many bright sources of light in our immediate neighborhood. In addition to estimates based on cosmological models, astronomers have used galaxy counts to set a lower limit for the EBL. Using a model close to this lower limit to calculate the expected absorption of very high-energy gamma rays from PKS 1424+240, the team derived an intrinsic gamma-ray emission spectrum for the blazar. The results, however, deviate from the expected emission based on current blazar models, which are thought to result from a relativistic jet of particles powered by matter falling onto a supermassive black hole at the center of the host galaxy.

Gamma rays from PKS 1424+240 were first detected by the Fermi Gamma-ray Space Telescope and subsequently by the ground-based instrument VERITAS (Very Energetic Radiation Imaging Telescope Array System), which is sensitive to gamma-rays in the very high-energy (VHE) band from about 100 GeV to more than 10 TeV. To determine the redshift of the blazar--a measure of how much the light from an object has been stretched to longer wavelengths by the expansion of the universe--the researchers used archival data obtained by the Hubble Space Telescope.

###

The other co-authors on the paper are David Williams, J. Xavier Prochaska, Joel Primack, also of UCSC; Charles Danforth and John Stocke of the University of Colorado; Meg Urry of Yale University; Alex Filippenko of UC Berkeley; and William Neely of the NF/ Observatory.

Support was provided by NASA awarded through grants from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA; the National Science Foundation award PHY-0970134; NASA grants NNX08AC146 and NAS5-98043 to the University of Colorado at Boulder ; NASA/Fermi grants GO-31089 and NNX12AF12GA; NSF grant AST-1211916; the Christopher R. Redlich Fund; the TABASGO Foundation; and NASA Hubble Fellowship grant HF-51305.01-A.

KAIT and its ongoing operation were made possible by donations from Sun Microsystems, Inc., the Hewlett-Packard Company, AutoScope Corporation, Lick Observatory, the NSF, the University of California, the Sylvia & Jim Katzman Foundation and the TABASGO Foundation.

The Carnegie Institution for Science is a private, nonprofit organization headquartered in Washington, D.C., with six research departments throughout the U.S. Since its founding in 1902, the Carnegie Institution has been a pioneering force in basic scientific research. Carnegie scientists are leaders in plant biology, developmental biology, astronomy, materials science, global ecology, and Earth and planetary science.


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High-energy astrophysics puzzle [ Back to EurekAlert! ] Public release date: 23-Apr-2013
[ | E-mail | Share Share ]

Contact: Michele Fumagalli
mfumagalli@obs.carnegiescience.edu
626-304-0274
Carnegie Institution

Pasadena, CA. Blazars are the brightest of active galactic nuclei, and many emit very high-energy gamma rays. New observations of a blazar known as PKS 1424+240 show that it is the most-distant known source of very high-energy gamma rays. But its emission spectrum appears highly unusual.

A team including Carnegie's Michele Fumagalli used data from the Hubble Space Telescope to set a lower limit for the blazar's redshift (z ? 0.6035). An object's redshift value is a measurement of how much the wavelength of the light from it that reaches Earth is stretched by the expansion of the Universe. Thus, it reveals the object's age and distance. This blazar's redshift corresponds to a distance of at least 7.4 billion light-years. Their work will be published by The Astrophysical Journal and is available online.

Over such a great distance, a substantial proportion of the gamma rays should be absorbed by the extragalactic background light, but calculations that account for the expected absorption yield an unexpected emission spectrum for the blazar.

"We're seeing an extraordinarily bright source that does not display the characteristic emission expected from a very high-energy blazar," said lead author Amy Furniss, University of California Santa Cruz.

The findings may indicate something new about the emission mechanisms of blazars, the extragalactic background light, or the propagation of gamma-ray photons over long distances. It was not thought that such high-energy gamma-ray sources could be seen at such great distances. The research should allow scientists to better understand cosmological models that predict the extragalactic background light.

The extragalactic background light (EBL) is the diffuse radiation from all stars and galaxies, a dim but pervasive glow that fills the universe. When a high-energy gamma-ray photon collides with a lower-energy EBL photon, they annihilate and create an electron-positron pair. The farther gamma rays have to travel, the more likely they are to be absorbed by this mechanism. This limits the distance to which sources of very high-energy gamma rays can be detected.

Measuring the EBL directly is extremely difficult because there are so many bright sources of light in our immediate neighborhood. In addition to estimates based on cosmological models, astronomers have used galaxy counts to set a lower limit for the EBL. Using a model close to this lower limit to calculate the expected absorption of very high-energy gamma rays from PKS 1424+240, the team derived an intrinsic gamma-ray emission spectrum for the blazar. The results, however, deviate from the expected emission based on current blazar models, which are thought to result from a relativistic jet of particles powered by matter falling onto a supermassive black hole at the center of the host galaxy.

Gamma rays from PKS 1424+240 were first detected by the Fermi Gamma-ray Space Telescope and subsequently by the ground-based instrument VERITAS (Very Energetic Radiation Imaging Telescope Array System), which is sensitive to gamma-rays in the very high-energy (VHE) band from about 100 GeV to more than 10 TeV. To determine the redshift of the blazar--a measure of how much the light from an object has been stretched to longer wavelengths by the expansion of the universe--the researchers used archival data obtained by the Hubble Space Telescope.

###

The other co-authors on the paper are David Williams, J. Xavier Prochaska, Joel Primack, also of UCSC; Charles Danforth and John Stocke of the University of Colorado; Meg Urry of Yale University; Alex Filippenko of UC Berkeley; and William Neely of the NF/ Observatory.

Support was provided by NASA awarded through grants from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA; the National Science Foundation award PHY-0970134; NASA grants NNX08AC146 and NAS5-98043 to the University of Colorado at Boulder ; NASA/Fermi grants GO-31089 and NNX12AF12GA; NSF grant AST-1211916; the Christopher R. Redlich Fund; the TABASGO Foundation; and NASA Hubble Fellowship grant HF-51305.01-A.

KAIT and its ongoing operation were made possible by donations from Sun Microsystems, Inc., the Hewlett-Packard Company, AutoScope Corporation, Lick Observatory, the NSF, the University of California, the Sylvia & Jim Katzman Foundation and the TABASGO Foundation.

The Carnegie Institution for Science is a private, nonprofit organization headquartered in Washington, D.C., with six research departments throughout the U.S. Since its founding in 1902, the Carnegie Institution has been a pioneering force in basic scientific research. Carnegie scientists are leaders in plant biology, developmental biology, astronomy, materials science, global ecology, and Earth and planetary science.


[ Back to EurekAlert! ] [ | E-mail | Share Share ]

?


AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.


Source: http://www.eurekalert.org/pub_releases/2013-04/ci-hap042313.php

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