Mathematics – Logic
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..526..480b&link_type=abstract
GAMMA-RAY BURSTS: 5th Huntsville Symposium. AIP Conference Proceedings, Volume 526, pp. 480-484 (2000).
Mathematics
Logic
Gamma-Ray Sources, Gamma-Ray Bursts, Jets And Bursts, Galactic Winds And Fountains, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies
Scientific paper
A number of gamma-ray bursts have spectra that are accurately fit by a Compton attenuated power-law spectrum. One free parameter in this spectral model is the cosmological redshift of the gamma-ray burst. From the fitting of this model to burst spectra observed with BATSE, values of z of order unity or greater were derived, a result that was later derived from optical observations. The model-derived z distribution contains many more bursts with z>2 than does the optically derived distribution. Fits of the model to gamma-ray spectra of bursts with optically derived redshifts are consistent with the observations for the 2 bursts that have spectra with x-ray excesses. In cases without an x-ray excess, the model is unable to fully explain the observations. This suggests that other processes in addition to Compton attenuation are required to fully explain the prompt gamma-ray spectrum. .
Brainerd Jerome J.
Preece Rob D.
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