Consistency of time dilation in temporal profiles and spectra of gamma-ray bursts

If γ-ray bursters are at cosmological distances — a possibility suggested by their isotropic distribution and spatial inhomogeneity — then the temporal profiles and spectra of more distant sources will be time dilated compared to those of relatively nearby sources. Analyses of bright and dim BATSE γ...

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Bibliographic Details
Published in:Advances in space research 1995-05, Vol.15 (5), p.135-138
Main Authors: Norris, J.P, Nemiroff, R.J, Bonnell, J.T, Scargle, J.D, Davis, S.P, Kouveliotou, C, Pendleton, G, Fishman, G.J, Meegan, C.A, Paciesas, W.S, Wickramasinghe, W.A.D.T
Format: Article
Language:English
Subjects:
Astrophysics
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Summary:If γ-ray bursters are at cosmological distances — a possibility suggested by their isotropic distribution and spatial inhomogeneity — then the temporal profiles and spectra of more distant sources will be time dilated compared to those of relatively nearby sources. Analyses of bright and dim BATSE γ-ray bursts yield a relative time-dilation factor of 2.3 on timescales of pulses and event durations. We redshift the spectra of time intervals near the intensity peaks of the bright sample on a trial grid and compare with spectra of the dim sample. A redshift factor of order two — with wide latitude permitted — brings the spectra of the two brightness groups into alignment. Thus there is coarse agreement with the time-dilation factor found in the temporal domain.
ISSN:0273-1177
1879-1948
DOI:10.1016/0273-1177(94)00053-4