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Compton scattering of self-absorbed synchrotron emission
Gao, He1; Lei, Wei-Hua1,2; Wu, Xue-Feng3,4; Zhang, Bing1,5,6
2013-11-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume435Issue:3Pages:2520-2531
Corresponding AuthorGao, H (通讯作者) Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA.
AbstractSynchrotron self-Compton (SSC) scattering is an important emission mechanism in many astronomical sources, such as gamma-ray bursts (GRBs) and active galactic nuclei. We give a complete presentation of the analytical approximations for the Compton scattering of synchrotron emission with both weak and strong synchrotron self-absorption. All possible orders of the characteristic synchrotron spectral breaks (nu(a), nu(m) and nu(c)) are studied. In the weak self-absorption regime, i.e. nu(a) < nu(c), the electron energy distribution is not modified by the self-absorption process. The shape of the SSC component broadly resembles that of synchrotron, but with the following features: The SSC flux increases linearly with frequency up to the SSC break frequency corresponding to the self-absorption frequency nu(a); and the presence of a logarithmic term in the high-frequency range of the SSC spectra makes it harder than the power-law approximation. In the strong absorption regime, i.e. nu(a) > nu(c), heating of low-energy electrons due to synchrotron absorption leads to pile-up of electrons, and form a thermal component besides the broken power-law component. This leads to two-component (thermal + non-thermal) spectra for both the synchrotron and SSC spectral components. For nu(c) < nu(a) < nu(m), the spectrum is thermal (non-thermal) dominated if nu(a) > root nu(m)nu(c) (nu(a) < root nu(m)nu(c)). Similar to the weak-absorption regime, the SSC spectral component is broader than the simple broken power-law approximation. We derive the critical condition for strong absorption (electron pile-up), and discuss a case of GRB reverse shock emission in a wind medium, which invokes nu(a) > max(nu(m), nu(c)).
KeywordRadiation Mechanisms: Non-thermal Gamma-ray Burst: General
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1093/mnras/stt1461
WOS KeywordRAY BURST AFTERGLOWS ; LIGHT CURVES ; ABSORPTION ; RADIATION ; DISTRIBUTIONS ; MODELS ; SHOCKS ; GRBS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000325773000053
Citation statistics
Cited Times:13[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/9922
Collection南极天文中心
Affiliation1.Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA
2.Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Peoples R China
3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
4.Chinese Ctr Antarctic Astron, Nanjing 210008, Peoples R China
5.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
6.Peking Univ, Dept Astron, Beijing 100871, Peoples R China
Recommended Citation
GB/T 7714
Gao, He,Lei, Wei-Hua,Wu, Xue-Feng,et al. Compton scattering of self-absorbed synchrotron emission[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2013,435(3):2520-2531.
APA Gao, He,Lei, Wei-Hua,Wu, Xue-Feng,&Zhang, Bing.(2013).Compton scattering of self-absorbed synchrotron emission.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,435(3),2520-2531.
MLA Gao, He,et al."Compton scattering of self-absorbed synchrotron emission".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 435.3(2013):2520-2531.
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