The Consistency of Standard Cosmology and the BATSE Number versus Brightness Relation
Abstract
The integrated numberpeakflux relation measured by the Burst and Transient Source Experiment (BATSE) on board the Compton Gamma Ray Observatory is compared with several standard cosmological distributions for gammaray bursts (GRBs). FriedmannRobertsonWalker models were used along with the assumption that the bursts are standard candles and have no number or luminosity evolution. For a given {OMEGA} and spectral shape, we used a free parameter, essentially the comoving number density of bursts, to generate a best fit between the cosmology and the measured relation. Our results are shown for a subsample of the first 260 GRBs recorded by BATSE. We find acceptable fits between simple cosmological models and the brightness distribution data, as determined by the KolmogorovSmirnov onedistribution statistical test. One cannot distinguish a single best cosmological model from the goodness of the fits. The best fit implies that BATSE GRBs are complete out to a redshift of about unity. However, significantly higher and lower redshifts, by as much as a factor of 2, are possible for other marginally acceptable fits.
 Publication:

The Astrophysical Journal
 Pub Date:
 July 1993
 DOI:
 10.1086/186911
 Bibcode:
 1993ApJ...411L..55W
 Keywords:

 Andromeda Galaxy;
 Brightness Distribution;
 Gamma Ray Bursts;
 Astronomical Models;
 Computational Astrophysics;
 Red Shift;
 Astrophysics;
 COSMOLOGY: OBSERVATIONS;
 GAMMA RAYS: BURSTS