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Low-energy Spectra of Gamma-Ray Bursts from Cooling Electrons
Geng, Jin-Jun1,2,3; Huang, Yong-Feng1,2; Wu, Xue-Feng4; Zhang, Bing5,6,7; Zong, Hong-Shi3,8
2018
Source PublicationASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
ISSN0067-0049
Volume234Issue:1Pages:32
Abstract

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.

Keywordgamma-ray burst: general methods: numerical radiation mechanisms: non-thermal relativistic processes
DOI10.3847/1538-4365/aa9e84
WOS KeywordDECAYING MAGNETIC-FIELD ; PROMPT EMISSION ; GENERAL-CONSIDERATIONS ; PHOTOSPHERIC EMISSION ; SYNCHROTRON-RADIATION ; AFTERGLOW EMISSION ; COMPTON-SCATTERING ; FERMI OBSERVATIONS ; DELAYED EMISSION ; GRB SPECTRA
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000422758300001
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22506
Collection中国科学院紫金山天文台
Corresponding AuthorGeng, Jin-Jun
Affiliation1.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
Recommended Citation
GB/T 7714
Geng, Jin-Jun,Huang, Yong-Feng,Wu, Xue-Feng,et al. Low-energy Spectra of Gamma-Ray Bursts from Cooling Electrons[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2018,234(1):32.
APA Geng, Jin-Jun,Huang, Yong-Feng,Wu, Xue-Feng,Zhang, Bing,&Zong, Hong-Shi.(2018).Low-energy Spectra of Gamma-Ray Bursts from Cooling Electrons.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,234(1),32.
MLA Geng, Jin-Jun,et al."Low-energy Spectra of Gamma-Ray Bursts from Cooling Electrons".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 234.1(2018):32.
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