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EARLY AFTERGLOWS OF GAMMA-RAY BURSTS IN A STRATIFIED MEDIUM WITH A POWER-LAW DENSITY DISTRIBUTION
Yi, Shuang-Xi1,2; Wu, Xue-Feng3,4,5; Dai, Zi-Gao1,2
2013-10-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume776Issue:2Pages:120-120
Corresponding AuthorYi, Shuang-Xi (通讯作者),Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China
AbstractA long-duration gamma-ray burst (GRB) has been widely thought to arise from the collapse of a massive star, and it has been suggested that its ambient medium is a homogenous interstellar medium (ISM) or a stellar wind. There are two shocks when an ultra-relativistic fireball that has been ejected during the prompt gamma-ray emission phase sweeps up the circumburst medium: a reverse shock that propagates into the fireball, and a forward shock that propagates into the ambient medium. In this paper, we investigate the temporal evolution of the dynamics and emission of these two shocks in an environment with a general density distribution of n proportional to R-k (where R is the radius) by considering thick-shell and thin-shell cases. A GRB afterglow with one smooth onset peak at early times is understood to result from such external shocks. Thus, we can determine the medium density distribution by fitting the onset peak appearing in the light curve of an early optical afterglow. We apply our model to 19 GRBs and find that their k values are in the range of 0.4-1.4, with a typical value of k similar to 1, implying that this environment is neither a homogenous ISM with k = 0 nor a typical stellar wind with k = 2. This shows that the progenitors of these GRBs might have undergone a new mass-loss evolution.
KeywordGamma-ray Burst: General Radiation Mechanisms: Non-thermal
Subject AreaPhysical, Chemical & Earth Sciences (Pces)
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/776/2/120
WOS KeywordEARLY OPTICAL AFTERGLOWS ; WIND INTERACTION-MODELS ; INITIAL LORENTZ FACTOR ; SWIFT XRT DATA ; X-RAY ; LIGHT CURVES ; ENERGY INJECTION ; MILLISECOND PULSARS ; CENTRAL ENGINE ; RADIO FLARES
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000327216100057
Citation statistics
Cited Times:28[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/9923
Collection南极天文中心
Affiliation1.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China
2.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China
3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
4.Chinese Acad Sci, Chinese Ctr Antarctic Astron, Nanjing 210008, Jiangsu, Peoples R China
5.Chinese Acad Sci, Joint Ctr Particle Nucl Phys & Cosmol Purple Mt O, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Yi, Shuang-Xi,Wu, Xue-Feng,Dai, Zi-Gao. EARLY AFTERGLOWS OF GAMMA-RAY BURSTS IN A STRATIFIED MEDIUM WITH A POWER-LAW DENSITY DISTRIBUTION[J]. ASTROPHYSICAL JOURNAL,2013,776(2):120-120.
APA Yi, Shuang-Xi,Wu, Xue-Feng,&Dai, Zi-Gao.(2013).EARLY AFTERGLOWS OF GAMMA-RAY BURSTS IN A STRATIFIED MEDIUM WITH A POWER-LAW DENSITY DISTRIBUTION.ASTROPHYSICAL JOURNAL,776(2),120-120.
MLA Yi, Shuang-Xi,et al."EARLY AFTERGLOWS OF GAMMA-RAY BURSTS IN A STRATIFIED MEDIUM WITH A POWER-LAW DENSITY DISTRIBUTION".ASTROPHYSICAL JOURNAL 776.2(2013):120-120.
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