Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aard.conf..197p&link_type=abstract
ASTRONOMY AND ASTROPHYSICS Recent Developments. Proceedings of the 10th Portuguese Meeting. Held 27-28 July 2000 in CENTRA, Lisb
Astronomy and Astrophysics
Astrophysics
Scientific paper
Gamma-ray bursts (GRBs) are the brightest known sources of electromagnetic radiation with up to 1053 erg emitted as gamma rays during an event which lasts just a few seconds. GRBs come from cosmological distances, with the measured and/or estimated redshift in the range 0.5 ÷ 5. The observed spectra are approximated with a broken power law, with the break at a few hundred keV. Since the beginning of 1997 the Itallien - Dutch satellite BeppoSAX discovered ~ 20 X-ray afterglows following GRBs, and fading rapidly in a few days. Accurate positions provided by BeppoSAX made it possible to discover several optical and radio afterglows, and some were followed for many months. They all appear to be located in star forming regions in very distant galaxies, indicating that GRBs are produced by explosions of very massive stars, more powerful than ordinary supernovae, hence the term 'hypernova' seems to be proper to describe the events. The redshifts of about 15 host galaxies were measured, and they are in the range z = 0.4 - 3.4...
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