Time-Dilation, Log N - Log P, and Cosmology

Details Time-Dilation, Log N - Log P, and Cosmology Time-Dilation, Log N - Log P, and Cosmology

1996-02-01

arxiv.org/abs/astro-ph/9602007v1

Astronomy and Astrophysics

Astrophysics

5 pages in LATeX, REVTEX style, 2 embedded figures. To appear in Third Huntsville Symposium on Gamma Ray Bursts Proceedings

Scientific paper

10.1063/1.51713

We investigate whether a simple cosmology can fit GRB results in both time dilation and Log N - Log P simultaneously. Simplifying assumptions include: all GRBs are spectrally identical to BATSE trigger 143, $\Omega=1$ universe, and no luminosity and number density evolution. Observational data used includes: the BATSE 3B peak brightness distribution (64-ms time scale), the Pioneer Venus Orbiter (PVO) brightness distribution, and the Norris et al. time dilation results for peak aligned profiles presented at this meeting. We find acceptable cosmological fits to the brightness distributions when placing BATSE trigger 143 at a redshift of 0.15 $\pm$ 0.10. This translates into a $(1 + z_{dim}) / (1 + z_{bright})$ factor of about 1.50 $\pm$ 0.50 between selected brightness extremes of the Norris et al. sample. Norris et al. estimate, however, that $(1 + z_{dim}) / (1 + z_{bright})$ $\approx$ 2.0 $\pm$ 0.5 when considering duration tests. The difference is marginal and could be accounted for by evolution. We therefore find that evolution of GRBs is preferred but not demanded.

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