Very early optical afterglows for geometric models of X-ray flashes and X-ray rich GRBs

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 宇宙伽马暴、中子星及相关物理研究团组

	Very early optical afterglows for geometric models of X-ray flashes and X-ray rich GRBs
	Ting Yan 1,2,3; Da-Ming Wei1,2,4 ; Yi-Zhong Fan1,2,5
刊名	CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
	2007
卷号	7 期号:6 页码:777-788
关键词	X-rays : general Gamma rays : bursts radiation mechanisms : non-thermal
ISSN号	1009-9271
英文摘要	If X-ray flashes (XRFs) and X-ray rich Gamma-ray Bursts (XRRGs) have the same origin as the Gamma-ray bursts (GRBs) but are viewed off-center from structured jets, their early afterglows may differ from those of GRBs, and when the ultra-relativistic outflow interacts with the surrounding medium, there are two shocks formed, a forward shock (FS), and a reverse shock (RS). We calculate numerically the early afterglow powered by uniform jets, Gaussian jets and power-law jets in the forward-reverse shock scenario. A set of differential equations govern the dynamical evolution. The synchrotron self-Compton effect has been taken into account in the calculation. In the uniform jets, the very early afterglows of XRRGs and XRFs are significantly lower than the GRBs and the observed peak times of RS emission are later in the interstellar medium environment. The RS components in XRRGs and XRFs are difficult to detect, but in the stellar wind environment, the reduction of the very early flux and the delay of the RS peak time are not so remarkable. In nonuniform jets (Gaussian and power-law jets), where there are emission materials on the line of sight, the very early light curve resembles equivalent isotropic ejecta in general although the RS flux decay index shows notable deviations if the RS is relativistic (in stellar wind).
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]	REVERSE SHOCK EMISSION ; 28 FEBRUARY 1997 ; BURST AFTERGLOWS ; LIGHT CURVES ; PHYSICAL PARAMETERS ; WIND ENVIRONMENTS ; PROMPT EMISSION ; LORENTZ FACTOR ; VIEWING ANGLE ; UNIVERSAL
收录类别	SCI
语种	英语
WOS记录号	WOS:000251938500005
公开日期	2012-02-05
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/2394]
专题	紫金山天文台_宇宙伽马暴、中子星及相关物理研究团组
作者单位	1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 3.Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80309 USA 4.Nanjing Univ, Joint Ctr Particle Nucl Phys & Cosmol, Purple Mt Observ, Nanjing 210008, Peoples R China 5.Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel
推荐引用方式 GB/T 7714	Ting Yan,Da-Ming Wei,Yi-Zhong Fan. Very early optical afterglows for geometric models of X-ray flashes and X-ray rich GRBs[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2007,7(6):777-788.
APA	Ting Yan,Da-Ming Wei,&Yi-Zhong Fan.(2007).Very early optical afterglows for geometric models of X-ray flashes and X-ray rich GRBs.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,7(6),777-788.
MLA	Ting Yan,et al."Very early optical afterglows for geometric models of X-ray flashes and X-ray rich GRBs".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 7.6(2007):777-788.