Detection of Signature Consistent with Cosmological Time Dilation in Gamma-Ray Bursts

Details Detection of Signature Consistent with Cosmological Time Dilation in Gamma-Ray Bursts Detection of Signature Consistent with Cosmological Time Dilation in Gamma-Ray Bursts

1993-12-21

arxiv.org/abs/astro-ph/9312049v1

Astronomy and Astrophysics

Astrophysics

in press: ApJ, Plain TeX: 18 pages, 4 figures, hard preprint available upon request, Report # RJNSISSA003

Scientific paper

10.1086/173912

If gamma-ray bursters are at cosmological distances - as suggested by their isotropic distribution on the sky and by their number-intensity relation - then the burst profiles will be stretched in time, by an amount proportional to the redshift, 1 + $z$. We have tested data from the {\it Compton} Gamma Ray Observatory's Burst and Transient Source Experiment (BATSE) for such time dilation. Our measures of time scale are constructed to avoid selection effects arising from intensity differences by rescale all bursts to fiducial levels of peak intensity and noise bias. The three tests involved total count rate above background, wavelet decomposition, and alignment of the highest peaks. In all three tests, the dim bursts are stretched by a factor of about two relative to the bright ones, over seven octaves of time scale. We calibrated the measurements by dilating synthetic bursts that approximate the temporal characteristics of bright BATSE bursts. Results are consistent with bursts of BATSE's peak-flux completeness limit being at cosmological distances corresponding to $z \sim 1$, and thus with independent cosmological interpretations of the BATSE number-intensity relation.

Affiliated with

Also associated with

No associations

Rating

Detection of Signature Consistent with Cosmological Time Dilation in Gamma-Ray Bursts does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Detection of Signature Consistent with Cosmological Time Dilation in Gamma-Ray Bursts, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Detection of Signature Consistent with Cosmological Time Dilation in Gamma-Ray Bursts will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-207232