Cosmological Time Dilation in Durations of Swift Long Gamma-Ray Bursts

Abstract

Cosmological time dilation is a fundamental phenomenon in an expanding universe, which stresses that both the duration and wavelength of the emitted light from a distant object at the redshift $z$ will be dilated by a factor of $1+z$ at the observer. By using a sample of 139 \emph{Swift} long GRBs with known redshift ($z\le 8.2$), we measure the observed duration ($T_{90}$) in the observed energy range between $140/(1+z)$ keV and $350/(1+z)$ keV, corresponding to a fixed energy range of 140-350 keV in the rest frame. We obtain a significant correlation between the duration and the factor $1+z$, i.e., $T_{90}=10.5(1+z{)}^{0.94\pm 0.26}$, which is well consistent with that expected from cosmological time dilation effect.

19 pages, 7 figures, 1 table. Accepted for publication in ApJL

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