2001A&A...376...10S -
Astronomy and Astrophysics, volume 376, 10-16 (2001/9-2)
Luminosity function of GRBs.
SETHI S. and BHARGAVI S.G.
Abstract (from CDS):
We attempt to constrain the luminosity function of Gamma Ray Bursts (GRBs) from the observed number count-flux relation and the afterglow redshift data. We assume three classes of luminosity functions for our analysis: (a) Log-normal distribution, (b) Schechter distribution, and (c) Scale-free distribution. We assume several models of the evolution of the GRB population for each luminosity function. Our analysis shows that: (a) log-normal is the only luminosity function that is compatible with both the observations. This result is independent of the GRB evolution model, (b) for log-normal function, the average photon luminosity L0 and the width of the luminosity function σ that are compatible with both the observations fall in the range: 1055s–1≲L0≲1056s–1 and 2≲σ≲3, (c) the agreement of observations with other luminosity functions requires the GRB population to evolve more strongly than the evolution of the star-formation rate of the universe.
Abstract Copyright:
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Journal keyword(s):
gamma rays: bursts - cosmology: observations
Simbad objects:
18
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