ON THE HIGH-ENERGY EMISSION OF THE SHORT GRB 090510

	ON THE HIGH-ENERGY EMISSION OF THE SHORT GRB 090510
	He, Hao-Ning 1,2,3,4; Wu, Xue-Feng2,3,5 ; Toma, Kenji 2,3; Wang, Xiang-Yu 1,4; Meszaros, Peter 2,3
刊名	ASTROPHYSICAL JOURNAL
	2011-05-20
卷号	733 期号:1 页码:22(11pp)
关键词	gamma-ray burst: general gamma-ray burst: individual (090510) radiation mechanisms: non-thermal
ISSN号	0004-637X
英文摘要	Long-lived high-energy (> 100 MeV) emission, a common feature of most Fermi-LAT-detected gamma-ray burst, is detected up to similar to 10(2) s in the short GRB 090510. We study the origin of this long-lived high-energy emission, using broadband observations including X-ray and optical data. We confirm that the late > 100 MeV, X-ray, and optical emission can be naturally explained via synchrotron emission from an adiabatic forward shock propagating into a homogeneous ambient medium with low number density. The Klein-Nishina effects are found to be significant, and effects due to jet spreading and magnetic field amplification in the shock appear to be required. Under the constraints from the low-energy observations, the adiabatic forward shock synchrotron emission is consistent with the later-time (t greater than or similar to 2 s) high-energy emission, but falls below the early-time (t < 2 s) high-energy emission. Thus we argue that an extra high-energy component is needed at early times. A standard reverse-shock origin is found to be inconsistent with this extra component. Therefore, we attribute the early part of the high-energy emission (t less than or similar to 2 s) to the prompt component, and the long-lived high-energy emission (t greater than or similar to 2 s) to the adiabatic forward shock synchrotron afterglow radiation. This avoids the requirement for an extremely high initial Lorentz factor.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	GAMMA-RAY BURST ; FERMI OBSERVATIONS ; LIGHT CURVES ; SPECTRAL COMPONENT ; AFTERGLOW EMISSION ; LORENTZ FACTOR ; SYNCHROTRON ; SHOCKS ; MODEL ; HYDRODYNAMICS
收录类别	SCI
语种	英语
WOS记录号	WOS:000290314600022
公开日期	2012-08-07
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/4469]
专题	紫金山天文台_南极天文中心
作者单位	1.Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China 2.Penn State Univ, Dept Astron & Astrophys, Dept Phys, Davey Lab 525, University Pk, PA 16802 USA 3.Penn State Univ, Ctr Particle Astrophys, Davey Lab 104, University Pk, PA 16802 USA 4.Nanjing Univ, Key Lab Modern Astron & Astrophys, Minist Educ, Nanjing 210093, Peoples R China 5.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
推荐引用方式 GB/T 7714	He, Hao-Ning,Wu, Xue-Feng,Toma, Kenji,et al. ON THE HIGH-ENERGY EMISSION OF THE SHORT GRB 090510[J]. ASTROPHYSICAL JOURNAL,2011,733(1):22(11pp).
APA	He, Hao-Ning,Wu, Xue-Feng,Toma, Kenji,Wang, Xiang-Yu,&Meszaros, Peter.(2011).ON THE HIGH-ENERGY EMISSION OF THE SHORT GRB 090510.ASTROPHYSICAL JOURNAL,733(1),22(11pp).
MLA	He, Hao-Ning,et al."ON THE HIGH-ENERGY EMISSION OF THE SHORT GRB 090510".ASTROPHYSICAL JOURNAL 733.1(2011):22(11pp).