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Cosmological Time Dilation in Durations of Swift Long Gamma-Ray Bursts
- Source :
- 2013, ApJL, 778, L11
- Publication Year :
- 2013
-
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 ($z\leq8.2$), 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., $T_{\rm{90}}=10.5(1+z)^{0.94\pm0.26}$, which is well consistent with that expected from cosmological time dilation effect.<br />Comment: 19 pages, 7 figures, 1 table. Accepted for publication in ApJL
- Subjects :
- Astrophysics - High Energy Astrophysical Phenomena
Subjects
Details
- Database :
- arXiv
- Journal :
- 2013, ApJL, 778, L11
- Publication Type :
- Report
- Accession number :
- edsarx.1309.5612
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1088/2041-8205/778/1/L11