Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...428l...1b&link_type=abstract
The Astrophysical Journal, vol. 428, no. 1, pt. 1, p. L1-L3
Astronomy and Astrophysics
Astronomy
26
Astronomical Models, Cosmology, Euclidean Geometry, Gamma Ray Astronomy, Gamma Ray Bursts, Relativistic Effects, Time, Distortion, Mathematical Models, Relativistic Theory
Scientific paper
If gamma-ray burst sources are cosmological in origin, then the time dilation at large z can correlate a burst's duration with its peak flux. Detection of this effect is thought by many to be strong evidence for a cosmological burst origin. In this Letter I show that an apparent time distortion--either a dilation or contraction--is generally expected for an ensemble of bursts that is spatially limited within Euclidean space. The appearance of this effect is correlated with the falling away of the log N-log P curve from a -3/2 slope line. An example of this effect is provided by the relativistic bulk motion model, which produces a strong time dilation when spatially limited in Euclidean space. As a consequence, envidence that weak bursts have longer durations than strong bursts is not evidence of a cosmological burst origin.
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