Statistical Study of Gamma-Ray Bursts with Jet Break Features in Multiwavelength Afterglow Emissions
Wen Zhao, Jia-Chang Zhang, Qingxiang Zhang, Jian-Tong Liang, Xiao-Hang Luan, Qi-Qi Zhou, Shuang-Xi Yi, Feifei Wang, Shaotong Zhang
Abstract
Abstract 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 θ jet is then calculated from the jet break time of the afterglow light curve. This allows the derivation of the collimation-corrected energy E jet 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 10 6 s, and the distribution of the collimation-corrected energy E jet peaks at ∼10 50 erg. We also confirmed the E γ ,iso − E p,i , E jet − E p,i and E γ ,iso − θ jet relations, and found E γ ,iso − T j,z − E p,i relation remains tight with more multiwavelength data. This tight E γ ,iso − T j,z − E p,i relation is also conformed by different groups of our selected GRBs in the paper. In addition, another two new and tighter correlations among E jet − T j,z − E p,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.