| Autor: |
Sethi, S., Bhargavi, S. G., Sethi, S., Bhargavi, S. G. |
| Zdroj: |
Astronomy and Astrophysics; September 2001, Vol. 376 Issue: 1 p10-16, 7p |
| Abstrakt: |
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 L0and the width of the luminosity function σthat are compatible with both the observations fall in the range: $10^{55} {\rm s^{-1}} \la L_0 \la 10^{56} {\rm s^{-1}}$and $ 2 \la \sigma \la 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. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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