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HIGH-ENERGY GAMMA-RAY AFTERGLOWS FROM LOW-LUMINOSITY GAMMA-RAY BURSTS
He, HN; Wang, XY; Yu, YW; Meszaros, P
2009
发表期刊ASTROPHYSICAL JOURNAL
卷号706期号:2页码:1152-1162
通讯作者[He, Hao-Ning ; Wang, Xiang-Yu ; Yu, Yun-Wei] Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China ; [Yu, Yun-Wei] Huazhong Normal Univ, Inst Astrophys, Wuhan 430079, Peoples R China ; [Meszaros, Peter] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA ; [Meszaros, Peter] Penn State Univ, Dept Phys, University Pk, PA 16802 USA ; [Wang, Xiang-Yu] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China
文章类型Article
摘要The observations of gamma- ray bursts (GRBs) such as 980425, 031203 and 060218, with luminosities much lower than those of other classic bursts, lead to the definition of a new class of GRBs-LL-GRBs. The nature of the outflow responsible for them is not yet clear. Two scenarios have been suggested: one is the conventional relativistic outflow with initial Lorentz factor of order of Gamma(0) greater than or similar to 10 and the other is a trans-relativistic outflow with Gamma(0) similar or equal to 1-2. Here, we compare the high-energy gamma-ray afterglow emission from these two different models, taking into account both synchrotron self-inverse Compton (SSC) scattering and the external inverse Compton scattering due to photons from the cooling supernova or hypernova envelope (SNIC). We find that the conventional relativistic outflow model predicts a relatively high gamma-ray flux from SSC at early times (<10(4) s for typical parameters) with a rapidly decaying light curve, while in the trans-relativistic outflow model, one would expect a much flatter light curve of high-energy gamma- ray emission at early times, which could be dominated by both the SSC emission and the SNIC emission, depending on the properties of the underlying supernova and the shock parameter epsilon(e) and epsilon(B). The Fermi Gamma-ray Space Telescope should be able to distinguish between the two models in the future.
关键词gamma rays: bursts
学科领域Astronomy & Astrophysics
DOI10.1088/0004-637X/706/2/1152
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语种英语
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000271872900016
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被引频次:11[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/239119
专题粒子天体物理中心
作者单位中国科学院高能物理研究所
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He, HN,Wang, XY,Yu, YW,et al. HIGH-ENERGY GAMMA-RAY AFTERGLOWS FROM LOW-LUMINOSITY GAMMA-RAY BURSTS[J]. ASTROPHYSICAL JOURNAL,2009,706(2):1152-1162.
APA He, HN,Wang, XY,Yu, YW,&Meszaros, P.(2009).HIGH-ENERGY GAMMA-RAY AFTERGLOWS FROM LOW-LUMINOSITY GAMMA-RAY BURSTS.ASTROPHYSICAL JOURNAL,706(2),1152-1162.
MLA He, HN,et al."HIGH-ENERGY GAMMA-RAY AFTERGLOWS FROM LOW-LUMINOSITY GAMMA-RAY BURSTS".ASTROPHYSICAL JOURNAL 706.2(2009):1152-1162.
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