NASA – Using observations from NASA’s Chandra X-ray Observatory, researchers have obtained the first X-ray evidence of a supernova shock wave breaking through a cocoon of gas surrounding the star that exploded. This discovery may help astronomers understand why some supernovas are much more powerful than others.
On Nov. 3, 2010, a supernova was discovered in the galaxy UGC 5189A, located about 160 million light years away. Using data from the All Sky Automated Survey telescope in Hawaii taken earlier, astronomers determined this supernova exploded in early October 2010.
This composite image of UGC 5189A shows X-ray data from Chandra in purple and optical data from Hubble Space Telescope in red, green and blue. SN 2010jl is the very bright X-ray source near the top of the galaxy.
A team of researchers used Chandra to observe this supernova in December 2010 and again in October 2011. The supernova was one of the most luminous that has ever been detected in X-rays.
In the first Chandra observation of SN 2010jl, the X-rays from the explosion’s blast wave were strongly absorbed by a cocoon of dense gas around the supernova. This cocoon was formed by gas blown away from the massive star before it exploded.
In the second observation taken almost a year later, there is much less absorption of X-ray emission, indicating that the blast wave from the explosion has broken out of the surrounding cocoon. The Chandra data show that the gas emitting the X-rays has a very high temperature — greater than 100 million degrees Kelvin – strong evidence that it has been heated by the supernova blast wave.
In a rare example of a cosmic coincidence, analysis of the X-rays from the supernova shows that there is a second unrelated source at almost the same location as the supernova. These two sources strongly overlap one another as seen on the sky. This second source is likely to be an ultraluminous X-ray source, possibly containing an unusually heavy stellar-mass black hole, or an intermediate mass black hole. Image Credit: X-ray: NASA/CXC/Royal Military College of Canada/P.Chandra et al); Optical: NASA/STScI
- Galactic Views (42) (theneteconomy.wordpress.com)
(Photo credit: jamesomalley)
By Niall Stanage – Conservatives are asking a vital question with more and more urgency as the election campaign progresses: Why isn’t President Obama doing worse?
Obama and his campaign team have rarely missed a trick, whether changing the subject of debate to immigration with his unexpected announcement on deportations, or using expiring student loan interest rates as a cudgel against congressional Republicans.
Critics complain that the errors exposed an experience gap between top Romneyites and Obama’s inner circle, which was battle-hardened by its 2008 fights with Hillary Clinton and John McCain.
“The art of campaigning is getting different groups to sign up for the same objective — your election,” said Simmons. “President Obama is clearly stitching together the coalition he needs to win.” more> http://tinyurl.com/7gra2t6
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- Conservative Mitt Romney Is Showered With Criticism From….Conservatives, Ralph Benko, Forbes
- Hill Poll: Majority believe Obama has changed country for worse, Sheldon Alberts, Hill
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By Jon Titus – The joint venture between NASA and SpaceX delivered 1,000 pounds (450kg) of supplies. According to Reuters, such launches cost between $83 million and $128 million, which comes to approximately $83,000 to $128,000 per pound to deliver food, water, toilet paper, replacement parts, new equipment, and so on. Though the successful launch and docking of the Dragon capsule captured all the attention, I wondered why we still put people in space and deliver supplies to them, when machines could function equally well without sleep, water, air, and nourishment. more> http://tinyurl.com/ch3dnja
France Télécom headquarters : 6 place d’Alleray, Paris 15th arr., France (Photo credit: Wikipedia)
By Leila Abboud – The national outage of France Telecom‘s mobile network lasted from Friday (July 6) night to Saturday afternoon, with 28 million customers unable to make calls or send text messages.
France Telecom is still investigating the cause of the outage with equipment suppliers Ericsson and Alcatel-Lucent. It said on Saturday that the most likely reason was a software glitch on equipment that helps to track mobile phones and identify subscribers’ details to allow calls and texts to be made. This could have led users to try their calls repeatedly, creating a flood of signaling traffic that brought down the whole network. more> http://tinyurl.com/7zx4e6g