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Monday, June 23, 2003

Cosmological Gamma-Ray Bursts and Hypernovae Conclusively Linked

A very bright burst of gamma-rays -- observed on March 29, 2003 by NASA's High Energy Transient Explorer, in a sky region within the constellation Leo -- show the gradual and clear emergence of a supernova spectrum of the most energetic class known, a "hypernova".
Hypernovae are caused by the explosion of a very heavy star - presumably over 25 times heavier than the Sun.
The measured expansion velocity (in excess of 30,000 km/sec) and the total energy released was exceptionally high, even within the elect hypernova class.
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