Astron. Astrophys. Suppl. Ser.
Volume 138, Number 3, September 1999Gamma-Ray Bursts in the Afterglow Era Contents Rome, November 3-6, 1998
|Page(s)||515 - 516|
|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.
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