The distance scale of cosmological γ-ray bursts.

Details The distance scale of cosmological γ-ray bursts. The distance scale of cosmological γ-ray bursts.

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...323..312w&link_type=abstract

Astronomy and Astrophysics, v.323, p.312-316

Astronomy and Astrophysics

Astrophysics

1

Cosmology: Theory, {Gamma} Rays: Bursts

Scientific paper

The isotropic but radially non-uniform distribution of γ-ray bursts (GRBs) observed with the Burst and Transient Source Experiment (BATSE) on board the Compton Gamma Ray Observatory (CGRO) suggests that the bursts may be at cosmological distances. At such distances, the expansion of the Universe should have two main effects on the statistics of γ-ray bursts: first, it should stretch the temporal structure, resulting in dimmer bursts to be longer than bright bursts; second, it would decrease the number of γ-ray bursts with distance, resulting in the value of to be smaller than 0.5. Here we have used the observed time dilation (~2) to estimate the distance of γ-ray bursts, and then we use another method, calculating the value of to obtain the distance of γ-ray bursts. These two methods are independent and should be self-consistent. Our results show that the redshift of the dimmest bursts determined from these two distinct methods are consistent, z_dimmest_~3.2, corresponding to a burst luminosity of L~4x10^50^erg/s, which is different from the results reported previously.

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