TeV afterglow emission from a structured GRB jet using the kinetic approach

被引:0
作者
Hope, John P. [1 ]
van Eerten, Hendrik J. [1 ]
Kundu, Sayan [1 ]
Schady, Patricia [1 ]
机构
[1] Univ Bath, Dept Phys, Bath BA2 7AY, England
基金
英国科学技术设施理事会; 英国工程与自然科学研究理事会;
关键词
astroparticle physics; radiation mechanisms: non-thermal; relativistic processes; software: simulations; gamma-ray bursts; GAMMA-RAY BURST; SYNCHROTRON SELF-COMPTON; X-RAY; LIGHT CURVES; RELATIVISTIC FIREBALLS; PARTICLE-ACCELERATION; SCALING RELATIONS; OUTFLOW STRUCTURE; ENERGY; SPECTRA;
D O I
10.1093/mnras/staf123
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Recent years have seen a growing sample of TeV emission detections in gamma-ray burst afterglows, as well as an increasing role for structured jets in afterglow modelling. Using a kinetic approach, we show that the structure of an afterglow jet impacts its TeV emission, with jets where the energy falls off more sharply with angle showing a decrease in Inverse Compton (IC) peak flux relative to synchrotron peak flux. We use a modified version of the code katu, to which we have added adiabatic expansion and a fully self-consistent treatment of IC cooling both for the electron and photon populations. We compare our results to the semi-analytical code afterglowpy, finding a good agreement with our model except at early times off-axis where the effects of baryon loading are important. We compare electron cooling in the cases where there is no IC cooling, Thomson cooling and an inclusion of Klein-Nishina (KN) effects, finding that the spectra can only be distinguished if the Compton potential is significantly increased. We obtain a similar cooling rate compared to semi-analytical solutions, with some small difference at the transition from IC to synchrotron dominated cooling. Finally, we use best-fit parameters determined by afterglowpy and re-scaled for our model to reproduce the light curves of GRB 170817A. For our choice of parameters, we find that GRB 170817 would not have been detected in the TeV domain if seen on-axis, even by the upcoming Cherenkov Telescope Array Observatory.
引用
收藏
页码:281 / 300
页数:20
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