On the nature of gamma-ray burst time dilations

Details On the nature of gamma-ray burst time dilations On the nature of gamma-ray burst time dilations

1994-06-02

arxiv.org/abs/astro-ph/9406007v1

Astrophys.J. 437 (1994) L107

Astronomy and Astrophysics

Astrophysics

9 pages uuencoded compressed postscript including 2 figures, Princeton University Observatory preprint POP-567. Submitted to A

Scientific paper

10.1086/187694

The recent discovery that faint gamma-ray bursts are stretched in time relative to bright ones has been interpreted as support for cosmological distances: faint bursts have their durations redshifted relative to bright ones. It was pointed out, however, that the relative time stretching can also be produced by an intrinsic correlation between duration and luminosity of gamma-ray bursts in a nearby, bounded distribution. While both models can explain the average amount of time stretching, we find a generic difference between them in the way the duration distribution of faint bursts deviates from that of bright ones. This allows us to distinguish between these two broad classes of model on the basis of the duration distributions of gamma-ray bursts, leading perhaps to an unambiguous determination of the distance scale of gamma-ray bursts. We apply our proposed test to the second BATSE catalog and conclude, with some caution, that the data favor a cosmological interpretation of the time dilation.

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