Astronomy and Astrophysics – Astronomy
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..15..135n&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 15, no. 5, p. (5)135-(5)138
Astronomy and Astrophysics
Astronomy
2
Gamma Ray Astronomy, Gamma Ray Bursts, Gamma Ray Spectra, Pulse Duration, Spectrum Analysis, Temporal Distribution, Time Dependence, Brightness, Gamma Ray Observatory, Hardness, Red Shift
Scientific paper
If gamma-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 Burst and Transient Source Experiment (BATSE) gamma-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.
Bonnell Jerry T.
Davis Stanley Peter
Fishman Gerald J.
Kouveliotou Chryssa
Meegan Charles A.
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