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Latest Gamma-ray burst progenitors Stories

2bea3292fac26fb161e548517985cd001
2005-12-15 15:50:00

NASA -- Scientists using NASA's Swift satellite have found evidence of a black hole swallowing a neutron star. The discovery is reported in the December 15 issue of Nature. This rare event, seen on July 24, created a gamma-ray burst that lasted only for a few milliseconds. However, observations of the lingering afterglow provided evidence of what could have been the demise of a neutron star orbiting a black hole. The black hole may have first stretched the dense neutron star into a crescent...

2005-10-05 14:16:16

An international team of scientists using three NASA satellites and a host of ground-based telescopes believes it has solved the greatest remaining mystery of the mysterious gamma-ray bursts (GRBs), the most powerful explosions in the universe. The shorter of two versions of these bursts appear to be caused by the collision of closely orbiting neutron stars or one of those compact stars and a black hole, said Don Lamb, the Louis Block Professor in Astronomy & Astrophysics at the...

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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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2005-05-26 17:25:00

Type Ic supernovae, or hypernovae, may be source of powerful bursts Berkeley -- Observations by two of the world's largest telescopes provide strong evidence that a peculiar type of exploding star may be the origin of elusive gamma-ray bursts that have puzzled scientists for more than 30 years. A team of astronomers from Italy, Japan, Germany and the United States, including the University of California, Berkeley, conclude from observations with the Keck and Subaru telescopes in Hawaii that...


Latest Gamma-ray burst progenitors Reference Libraries

6_f3739d4b04b11a1c267bfcc286610ef92
2004-10-19 04:45:41

Hypernova -- A hypernova is a theoretical type of supernova produced when exceptionally large stars collapse at the end of their lifespan. In a hypernova, the core of the star collapses directly into a black hole and two extremely energetic jets of plasma are emitted from its rotational poles at nearly light speed. These jets emit intense gamma rays, and are a candidate explanation for gamma ray bursts. Theorists have come up with several plausible explanations for hypernovae. It may...

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2004-10-19 04:45:41

Gamma-Ray Burst -- In astronomy, Gamma-ray bursters (GRBs) are flashes of gamma rays that last from seconds to hours, the longer ones being followed by several days of X-ray afterglow. They occur at random positions in the sky several times each day. They are now believed to result from tremendous explosions in far away galaxies, during the creation of a black hole from a dying star or two colliding neutron stars. The black hole, surrounded by a rotating disk of matter falling into it,...

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Word of the Day
negawatt
  • A unit of saved energy.
Coined by Amory Lovins, chairman of the Rocky Mountain Institute as a contraction of negative watt on the model of similar compounds like megawatt.