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Synchrotron Spectrum of Fast Cooling Electrons in GRBs
Zhao XH(赵晓红)1,2,3; Bai JM(白金明)1,2,3; Zhao, Xiao-Hong(Chinese Acad Sci, Yunnan Observ, 396 Yangfangwang, Guandu Dist 650216, Kunming, Peoples R China)
发表期刊ASTROPHYSICAL JOURNAL
2017-04-20
卷号839期号:2页码:74-80
DOI10.3847/1538-4357/aa692b
产权排序第1完成单位
收录类别SCI
关键词Gamma-ray Burst: General Radiation Mechanisms: Non-thermal Shock Waves
摘要We discuss the synchrotron emission of fast cooling electrons in shocks. The fast cooling electrons behind the shocks can generate a position-dependent inhomogeneous electron distribution if they do not have enough time to mix homogeneously. This can lead to a very different synchrotron spectrum in low-frequency bands from that in the homogeneous case, due to the synchrotron absorption. In this paper, we calculate the synchrotron spectrum in the inhomogeneous case in a gamma-ray burst (GRB). Both the forward shock and the reverse shock are considered. We find that for the reverse shock dominated case, we would expect a "reverse shock bump" in the low-frequency spectrum. The spectral bump is due to the combination of synchrotron absorption in both the forward and reverse shock regions. In the low frequencies the forward shock spectrum has two unconventional segments, with spectral slopes of less than or similar to 1 and 11/8. The slope of 11/8 has been found by some authors, while the slope of less than or similar to 1 is new and due to the approximately constant electron temperature in the optically thick region. In the future, simultaneous observations in multiple bands (especially in the low-frequency bands) in the GRB early afterglow or prompt emission phases will possibly reveal these spectral characteristics and enable us to identify the reverse shock component and distinguish between the forward and reverse shock emissions. This also may be a method with which to diagnose the electron distribution status (homogeneous or inhomogeneous) after fast cooling in the relativistic shock region.
项目资助者Chinese Natural Science Foundation(11203067, 11133006, 11433004) ; Yunnan Natural Science Foundation(2011FB115, 2014FB188) ; Key Research Program of the CAS(KJZD-EW-M06)
语种英语
学科领域天文学
文章类型Article
ISSN0004-637X
URL查看原文
归档日期2017-04-21
WOS记录号WOS:000399673300005
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]RAY BURST AFTERGLOWS ; OPTICAL FLASHES ; REVERSE SHOCK ; LIGHT CURVES ; EMISSION ; MODEL
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/10180
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, Xiao-Hong(Chinese Acad Sci, Yunnan Observ, 396 Yangfangwang, Guandu Dist 650216, Kunming, Peoples R China)
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming, 650216, China
2.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing, 100012, China
3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming, 650216, China
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GB/T 7714
Zhao XH,Bai JM,Zhao, Xiao-Hong. Synchrotron Spectrum of Fast Cooling Electrons in GRBs[J]. ASTROPHYSICAL JOURNAL,2017,839(2):74-80.
APA Zhao XH,Bai JM,&Zhao, Xiao-Hong.(2017).Synchrotron Spectrum of Fast Cooling Electrons in GRBs.ASTROPHYSICAL JOURNAL,839(2),74-80.
MLA Zhao XH,et al."Synchrotron Spectrum of Fast Cooling Electrons in GRBs".ASTROPHYSICAL JOURNAL 839.2(2017):74-80.
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