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Latest Gamma-ray astronomy Stories

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2005-07-13 13:05:00

ESA -- An international team of scientists has uncovered a rare type of neutron star so elusive that it took three satellites to identify it. The findings, made with ESA's Integral satellite and two NASA satellites, reveals new insights about star birth and death in our Galaxy. We report this discovery, highlighting the complementary nature of European and US spacecraft, on the day in which ESA's Integral celebrates 1000 days in orbit. The neutron star, called IGR J16283-4838, is an...

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2005-07-09 18:42:56

PPARC -- In a recent issue of Science Magazine, the High Energy Stereoscopic System (H.E.S.S.) team of international astrophysicists reports the discovery of another new type of very high energy (VHE) gamma ray source. Gamma-rays are produced in extreme cosmic particle accelerators such as supernova explosions and provide a unique view of the high energy processes at work in the Milky Way. VHE gamma-ray astronomy is still a young field and H.E.S.S. is conducting the first sensitive survey at...

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2005-06-02 07:05:00

Observations of a cosmic explosion detected on Feb. 15 by two NASA satellites have thrown into doubt one popular explanation for such explosions and have also seriously weakened the argument for yet another, according to University of Chicago astrophysicist Don Lamb. But solving the mystery any time soon may be forestalled by plans to shut down one of the satellites in September. The explosion in question is a powerful burst of X-rays called an X-ray flash that was observed by NASA's Swift...

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2005-06-01 07:01:08

Minneapolis, Minn. -- Astronomers have uncovered tantalizing insights into the origin of short gamma-ray bursts "“ mysterious, split-second high-energy flashes that have eluded detailed study until now. Unlike their long-duration cousins, which are known to arise when massive young stars die, short bursts are thought to occur when old, dense neutron stars collide. New evidence supports this distinct progenitor population, heralding the opening of a new chapter in the study of nature's...

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2005-04-07 07:05:00

NASA -- Scientists at NASA and the University of Kansas say that a mass extinction on Earth hundreds of millions of years ago could have been triggered by a star explosion called a gamma-ray burst. The scientists do not have direct evidence that such a burst activated the ancient extinction. The strength of their work is their atmospheric modeling -- essentially a "what if" scenario. The scientists calculated that gamma-ray radiation from a relatively nearby star explosion, hitting the Earth...

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2005-03-25 02:50:00

PPARC --  In the March 25th 2005 issue of Science Magazine, the High Energy Stereoscopic System (H.E.S.S.) team of international astrophysicists, including UK astronomers from the University of Durham, report results of a first sensitive survey of the central part of our galaxy in very high energy (VHE) gamma-rays. Included among the new objects discovered are two 'dark accelerators' - mysterious objects that are emitting energetic particles, yet apparently have no optical or x-ray...

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2005-03-25 02:48:25

NASA -- A NASA-funded scientist has produced a new type of picture of the Earth from space, which complements the familiar image of our "blue marble". This new picture is the first detailed image of our planet radiating gamma rays, a type of light that is millions to billions of times more energetic than visible light. The image portrays how the Earth is constantly bombarded by particles from space. These particles, called cosmic rays, hit our atmosphere and produce the gamma-ray light high...

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2005-01-06 07:43:16

NASA -- The NASA-led Swift mission has opened its doors to a flurry of gamma-ray burst action. Scientists were still calibrating the main instrument, the Burst Alert Telescope (BAT), when the first burst appeared on December 17. Three bursts on December 19, and one on December 20, followed. Swift's primary goal is to unravel the mystery of gamma ray bursts. The bursts are random and fleeting explosions, second only to the Big Bang in total energy output. Gamma rays are a type of light...

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2004-11-28 10:54:00

When the SWIFT detector looks at the sky using its gamma-ray sensitive view, the chance to unravel the cause of the most energetic stellar events may become possible. Astrobiology Magazine -- Imagine an explosion that could emit a million times more energy than the combined output of all the stars in the Milky Way. If you could hear this burst, it would deafen you. If you could see one, it would blind you. Any life within a radius of many solar systems would be annihilated. But just such an...


Latest Gamma-ray astronomy Reference Libraries

7_7ab115b117284658644e345b89f5ba712
2004-10-19 04:45:43

Gamma-Ray Astronomy -- Gamma-ray astronomy is the astronomical study of gamma rays. Long before experiments could detect gamma rays emitted by cosmic sources, scientists had known that the universe should be producing these photons. Work by Feenberg and Primakoff in 1948, Hayakawa and Hutchinson in 1952, and, especially, Morrison in 1958 had led scientists to believe that a number of different processes which were occurring in the universe would result in gamma-ray emission. These...

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