| Issue |
Astron. Astrophys. Suppl. Ser.
Volume 138, Number 3, September 1999
Gamma-Ray Bursts in the Afterglow Era Contents Rome, November 3-6, 1998
|
|
|---|---|---|
| Page(s) | 515 - 516 | |
| DOI | https://doi.org/10.1051/aas:1999332 | |
| Published online | 15 September 1999 | |
Time dilation and the star formation scenario
Department of Physics, Yale University, New Haven, CT 06520-8120, U.S.A.
Received:
8
December
1998
Accepted:
16
June
1999
We investigate the dependence of the redshift vs. brightness relation of
GRBs upon the width of GRB luminosity function and the cosmological
models. The relation is then fit to our observed time dilation data of
GRBs. It is found that the best fit average luminosity ranges from 
in a standard candle
luminosity model to 
in a cosmological model with a broad luminosity function 
. Our fits suggest that it is only possible to
accomodate the large distance scale suggested by the Star Formation Rate
model when the luminosity function has a large width 
in a
cosmological model with low matter density 
.
Key words: gamma-rays: bursts
© European Southern Observatory (ESO), 1999