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GAMMA-RAY BURST SPECTRUM WITH DECAYING MAGNETIC FIELD
Zhao XH(赵晓红)1,2,3; Li, Z2,4; Liu, XW3,5; Zhang, BB3,6; Bai JM(白金明)1,2; Meszaros, P3; Zhao, XH (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL
2014-01
卷号780期号:1页码:12-
DOI10.1088/0004-637X/780/1/12
产权排序第1完成单位
收录类别SCI
关键词Gamma-ray Burst: General Magnetic Fields Radiation Mechanisms: Non-thermal
摘要In the internal shock model for gamma-ray bursts (GRBs), the synchrotron spectrum from the fast cooling electrons in a homogeneous downstream magnetic field (MF) is too soft to produce the low-energy slope of GRB spectra. However, the MF may decay downstream with distance from the shock front. Here we show that the synchrotron spectrum becomes harder if electrons undergo synchrotron and inverse-Compton cooling in a decaying MF. To reconcile this with the typical GRB spectrum with low-energy slope nu F-nu proportional to nu, the postshock MF decay time must be comparable to the cooling time of the bulk electrons (corresponding to a MF decaying length typically of similar to 10(5) skin depths); that the inverse-Compton cooling should dominate synchrotron cooling after the MF decay time; and/or that the MF decays with comoving time roughly as B proportional to t(-1.5). An internal shock synchrotron model with a decaying MF can account for the majority of GRBs with low-energy slopes not harder than nu(4/3).
项目资助者Chinese Natural Science Foundation [11203067] ; Yunnan Natural Science Foundation [2011FB115] ; West Light Foundation of the CAS ; NSFC [11273005, 11133006, 11003014/A0303] ; MOE Ph.D. Programs Foundation, China [20120001110064] ; CAS Open Research Program of Key Laboratory for the Structure and Evolution of Celestial Objects ; National Basic Research Program (973 Program) of China [2014CB845800] ; NASA [NNX13AH50G]
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
URL查看原文
归档日期2013-12-11
WOS记录号WOS:000328937100012
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]RELATIVISTIC COLLISIONLESS SHOCKS ; SYNCHROTRON EMISSION ; EVOLUTION ; PROMPT ; GRB090902B ; MECHANISM ; AFTERGLOW ; COMPONENT ; MODELS ; GRB
引用统计
被引频次:20[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5452
专题丽江天文观测站(南方基地)
中国科学院天体结构与演化重点实验室
通讯作者Zhao, XH (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
作者单位1.Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China
2.Key Laboratory for the Structure and Evolution of Celestial Bodies, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China
3.Department of Astronomy and Astrophysics and Department of Physics, The Pennsylvania State University, University Park, PA 16802, USA
4.Department of Astronomy and Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China
5.Department of Physics, Sichuan University, Chengdu 610065, China
6.Center for Space Plasma and Aeronomic Research (CSPAR), University of Alabama in Huntsville, Huntsville, AL 35899, USA
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GB/T 7714
Zhao XH,Li, Z,Liu, XW,et al. GAMMA-RAY BURST SPECTRUM WITH DECAYING MAGNETIC FIELD[J]. ASTROPHYSICAL JOURNAL,2014,780(1):12-.
APA Zhao XH.,Li, Z.,Liu, XW.,Zhang, BB.,Bai JM.,...&Zhao, XH .(2014).GAMMA-RAY BURST SPECTRUM WITH DECAYING MAGNETIC FIELD.ASTROPHYSICAL JOURNAL,780(1),12-.
MLA Zhao XH,et al."GAMMA-RAY BURST SPECTRUM WITH DECAYING MAGNETIC FIELD".ASTROPHYSICAL JOURNAL 780.1(2014):12-.
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