Low-energy Spectra of Gamma-Ray Bursts from Cooling Electrons

被引：65

作者：

Geng, Jin-Jun ^{[1
,2
,3
]}

Huang, Yong-Feng ^{[1
,2
]}

Wu, Xue-Feng ^{[4
]}

Zhang, Bing ^{[5
,6
,7
]}

Zong, Hong-Shi ^{[3
,8
]}

机构：

[1] Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Jiangsu, Peoples R China

[2] Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210023, Jiangsu, Peoples R China

[3] Nanjing Univ, Dept Phys, Nanjing 210093, Jiangsu, Peoples R China

[4] Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China

[5] Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA

[6] Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China

[7] Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China

[8] Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210093, Jiangsu, Peoples R China

来源：

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | 2018年 / 234卷 / 01期

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

gamma-ray burst: general; methods: numerical; radiation mechanisms: non-thermal; relativistic processes; DECAYING MAGNETIC-FIELD; PROMPT EMISSION; GENERAL-CONSIDERATIONS; PHOTOSPHERIC EMISSION; SYNCHROTRON-RADIATION; AFTERGLOW EMISSION; COMPTON-SCATTERING; FERMI OBSERVATIONS; DELAYED EMISSION; GRB SPECTRA;

D O I：

10.3847/1538-4365/aa9e84

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The low-energy spectra of gamma-ray bursts' (GRBs)prompt emission are closely related to the energy distribution of electrons, which is further regulated by their cooling processes. We develop a numerical code to calculate the evolution of the electron distribution with given initial parameters, in which three cooling processes (i.e., adiabatic, synchrotron, and inverse Compton cooling) and the effect of a decaying magnetic field are coherently considered. A sequence of results is presented by exploring the plausible parameter space for both the fireball and the Poynting flux-dominated regime. Different cooling patterns for the electrons can be identified, and they are featured by a specific dominant cooling mechanism. Our results show that the hardening of the low-energy spectra can be attributed to the dominance of synchrotron self-Compton cooling within the internal shock model or to decaying synchrotron cooling within the Poynting flux-dominated jet scenario. These two mechanisms can be distinguished by observing the hard low-energy spectra of isolated short pulses in some GRBs. The dominance of adiabatic cooling can also lead to hard low-energy spectra when the ejecta is moving at an extreme relativistic speed. The information from the time-resolved low-energy spectra can help to probe the physical characteristics of the GRB ejecta via our numerical results.

引用

页数：32

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