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

	Low-energy Spectra of Gamma-Ray Bursts from Cooling Electrons
	Geng, Jin-Jun; Huang, Yong-Feng; Wu, Xue-Feng; Zhang, Bing; Zong, Hong-Shi
刊名	ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
	2018
卷号	234 期号:1 页码:3
英文摘要	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.
语种	英语
WOS记录号	WOS:000422758300001
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/18023]
专题	中国科学院紫金山天文台
推荐引用方式 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):3.
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),3.
MLA	Geng, Jin-Jun,et al."Low-energy Spectra of Gamma-Ray Bursts from Cooling Electrons".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 234.1(2018):3.