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Jets in a Gamma-Ray Burst During its Prompt Emission: Evolution of Lorentz Factor

Jing LiDa-Bin LinRui-Jing Lu ...+5 En-Wei Liang
Dec 2022
摘要
Knowledge about the Lorentz factor and its evolution of relativistic jets ingamma-ray bursts (GRBs) is crucial to understand their physics. An exact valueof bulk Lorentz factor can be estimated based on a high-energy spectral cutoff,which may appear in GRBs' prompt emission owing to the absorption ofphoton-photon pair production. In this work, we focus on the investigation ofthe bulk Lorentz factor evolution of jets in an individual burst. Based on\textsl{Fermi} observations, we search for the bursts with multiple$\gamma$-ray pulses characterized by a high-energy spectral cutoff, and nineGRBs are obtained. Together with the estimation of the pulse duration andradiation spectrum, the Lorentz factor of jets corresponding to differentpulses in an individual GRB are estimated. It is shown that the Lorentz factorof jets in an individual GRB fluctuates within a certain range and without ageneral trend in these nine GRBs. In addition, the Lorentz factors of the jetsin GRBs~130821A, 160509A and 160625B seem to increase with time. We also studythe relations among $L_{\rm iso }$, $E_{\rm p,z}$, and $\Gamma$ for the pulsesin our sample, which is found to be consistent with that found in previousworks.
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