Astrophys. J., 900, 112-112 (2020/September-2)
Statistical study of gamma-ray bursts with jet break features in multiwavelength afterglow emissions.
ZHAO W., ZHANG J.-C., ZHANG Q.-X., LIANG J.-T., LUAN X.-H., ZHOU Q.-Q., YI S.-X., WANG F.-F. and ZHANG S.-T.
Abstract (from CDS):
It is generally supposed that a transition from the normal decay phase (decay slope ∼-1) to a steeper phase (decay slope ∼-2) could be suggested as a jet break. The jet opening angle θjet is then calculated from the jet break time of the afterglow light curve. This allows the derivation of the collimation-corrected energy Ejet of those gamma-ray bursts (GRBs). We extensively searched for the GRBs with jet break features from multiwavelength afterglow light curves, and 138 GRBs with significant breaks were collected. The jet break times of those GRBs mainly range from 1000 to 106 s, and the distribution of the collimation-corrected energy Ejet peaks at ∼1050 erg. We also confirmed the Eγ,iso-Ep,i, Ejet-Ep,i and Eγ,iso-θjet relations, and found Eγ,iso-Tj,z-Ep,i relation remains tight with more multiwavelength data. This tight Eγ,iso-Tj,z-Ep,i relation is also conformed by different groups of our selected GRBs in the paper. In addition, another two new and tighter correlations among Ejet-Tj,z-Ep,i are well confirmed for different circumburst mediums in this paper. We suggest that those tight three-parameter correlations are more physical, and could be widely applied to constrain the cosmological parameters.
© 2020. The American Astronomical Society. All rights reserved.
Gamma-ray bursts - Non-thermal radiation sources
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