Cosmological Time Dilation in Short Gamma-ray Bursts

Details Cosmological Time Dilation in Short Gamma-ray Bursts Cosmological Time Dilation in Short Gamma-ray Bursts

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...483l..25c&link_type=abstract

Astrophysical Journal Letters v.483, p.L25

Astronomy and Astrophysics

Astronomy

13

Gamma Rays: Bursts

Scientific paper

Using the parameter V [=( C bar 64)max/( C bar 1024)max], the ratio of expected peak counts in 64 ms and 1024 ms, proposed by Che et al. recently, we find the cosmological time dilation in short gamma-ray bursts (t90 < 1.5 s) directly from the Burst and Transient Source Experiment catalog. The parameter V of short bursts shows a good correlation with the brightness B when we use ( C bar 64)max as a measure of brightness B rather than ( C bar 1024)max, introduced by Lamb et al. in 1993. In a Friedmann universe with Omega = 1 and Lamda = 0, the estimated redshift is about 2 and the time dilation factor (TDF) with the energy correction is about 1.8. The fact that these results generally agree with those found in long bursts supports the same origin of long and short gamma-ray bursts.

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