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Analytical light curves in the realistic model for gamma-ray burst afterglows
Wu, XF; Dai, ZG; Huang, YF; Lu, T
2005-02-01
Source PublicationASTROPHYSICAL JOURNAL
Volume619Issue:2Pages:968-982
AbstractAfterglow light curves are constructed analytically for realistic gamma-ray burst remnants decelerating in either a homogeneous interstellar medium or a stellar wind environment, taking into account the radiative loss of the blast wave, which affects the temporal behaviors significantly. Inverse Compton scattering, which plays an important role when the energy equipartition factor epsilon(e) of electrons is much larger than that of the magnetic field (epsilon(B)), is considered. The inverse Compton effect prolongs the fast cooling phase markedly, during which the relativistic shock is semiradiative and the radiation efficiency is approximately constant, epsilon = epsilon(e). It is further shown that the shock is still semiradiative for quite a long time after it transits into the slow cooling phase because of a slow decreasing rate of the radiation efficiency of electrons. The temporal decaying index of the X-ray afterglow light curve in this semiradiative phase is (3p + 2 + 2epsilon)/(4 - epsilon) in the interstellar medium case and [3p - 2 - (p - 2)epsilon]/2(2 - epsilon) in the stellar wind case, where p is the distribution index of the shock-accelerated electrons. Taking p = 2.2-2.3 as implied from the common shock acceleration mechanism and assuming epsilon(e) similar to 1/3, the temporal index is more consistent with the observed (alpha(X)) similar to 1.3 than the commonly used adiabatic one. The observability of the inverse Compton component in soft X-ray afterglows is also investigated. To manifest as a bump or even dominant in the X-ray afterglows during the relativistic stage, the density must be larger than similar to1-10 cm(-3) in the interstellar medium case, or the wind parameter A(*) must be larger than similar to1 in the stellar wind case.
KeywordGamma Rays : Bursts Hydrodynamics Ism : Jets And Outflows Radiation Mechanisms : Nonthermal Relativity Stars : Mass Loss
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordRELATIVISTIC BLAST WAVES ; 25 APRIL 1998 ; RADIATIVE EFFICIENCY ; UNUSUAL SUPERNOVA ; COMPTON EMISSION ; FLUID-DYNAMICS ; FIREBALL MODEL ; KINETIC-ENERGY ; SHOCKS ; ENVIRONMENTS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000226589100026
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/11107
Collection院士文集_陆埮
Affiliation1.Nanjing Univ, Dept Astron, Nanjing 210093, Jiangsu, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Wu, XF,Dai, ZG,Huang, YF,et al. Analytical light curves in the realistic model for gamma-ray burst afterglows[J]. ASTROPHYSICAL JOURNAL,2005,619(2):968-982.
APA Wu, XF,Dai, ZG,Huang, YF,&Lu, T.(2005).Analytical light curves in the realistic model for gamma-ray burst afterglows.ASTROPHYSICAL JOURNAL,619(2),968-982.
MLA Wu, XF,et al."Analytical light curves in the realistic model for gamma-ray burst afterglows".ASTROPHYSICAL JOURNAL 619.2(2005):968-982.
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