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Inferring the emission regions for different kinds of gamma-ray bursts
Zhang ZB(张志彬)3; Xie GZ(谢光中)1; Deng, JG2; Wei BT(魏丙涛)1,3; Zhang, ZB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 10, Kunming 650011, Yunnan, Peoples R China.
Source PublicationASTRONOMISCHE NACHRICHTEN
2007
Volume328Issue:1Pages:99-104
DOI10.1002/asna.200610666
Contribution Rank第1完成单位
Indexed BySCI
KeywordGamma-rays : Bursts Gamma Rays : Theory Methods : Numerical
AbstractUsing a theoretical model describing pulse shapes, we have clarified the relations between the observed pulses and their corresponding timescales, such as the angular spreading time, the dynamic time as well as the cooling time. We find that the angular spreading timescale caused by curvature effect of fireball surface only contributes to the falling part of the observed pulses, while the dynamic one in the co-moving frame of the shell merely contributes to the rising portion of pulses provided the radiative time is negligible. In addition, the pulses resulted from the pure radiative cooling time of relativistic electrons exhibit properties of fast rise and slow decay (a quasi-FRED) profile together with smooth peaks. Besides, we interpret the phenomena of wider pulses tending to be more asymmetric to be a consequence of the difference in emission regions. Meanwhile, we find the intrinsic emission time is decided by the ratios of lorentz factors and radii of the shells between short and long bursts. Based on the analysis of asymmetry, our results suggest that the long GRB pulses may occur in the regions with larger radius, while the short bursts could locate at the smaller distance from central engine. (c) 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN0004-6337
URL查看原文
Archive Date2006-12-13
WOS IDWOS:000244047200014
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordEXTERNAL SHOCK MODEL ; INTERNAL SHOCKS ; SPECTRAL LAGS ; TEMPORAL PROPERTIES ; FIREBALL MODEL ; LIGHT CURVES ; PULSE-WIDTH ; VARIABILITY ; AFTERGLOWS ; EVOLUTION
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Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/7029
Collection星系研究组
Corresponding AuthorZhang, ZB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 10, Kunming 650011, Yunnan, Peoples R China.
Affiliation1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P. O. Box 110, Kunming, Yunnan, 650011, P.R. China
2.Physics Science and Technology Institute, Guangxi University, Nanning, Guangxi, 530004, P.R. China
3.The Graduate School of the Chinese Academy of Sciences, Beijing, 100049, P.R. China
Recommended Citation
GB/T 7714
Zhang ZB,Xie GZ,Deng, JG,et al. Inferring the emission regions for different kinds of gamma-ray bursts[J]. ASTRONOMISCHE NACHRICHTEN,2007,328(1):99-104.
APA Zhang ZB,Xie GZ,Deng, JG,Wei BT,&Zhang, ZB .(2007).Inferring the emission regions for different kinds of gamma-ray bursts.ASTRONOMISCHE NACHRICHTEN,328(1),99-104.
MLA Zhang ZB,et al."Inferring the emission regions for different kinds of gamma-ray bursts".ASTRONOMISCHE NACHRICHTEN 328.1(2007):99-104.
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