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Characteristics of profiles of gamma-ray burst pulses associated with the Doppler effect of fireballs
Tan YP(覃一平)1,2; Zhang ZB(张志彬)1,3; Zhang,FW2; Cui XH(崔晓红)1,3; Qin, YP (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Yunnan, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL
2004-12-10
卷号617期号:1页码:439-460
DOI10.1086/425335
产权排序第1完成单位
收录类别SCI
关键词Gamma Rays : Bursts Gamma Rays : Theory Relativity
摘要In this paper we derive in great detail the formula for count rates of gamma-ray bursts (GRBs) in the framework of fireballs, in terms of the integral of time, where the Doppler effect of the expanding fireball surface is the key factor concerned. Effects arising from the limit on the time delay due to the limited emitting areas on the fireball surface and other factors are investigated. Our analysis shows that the formula for the count rate of fireballs can be expressed as a function of tau, which is the observation timescale relative to the dynamical timescale of the fireball defined by R-c/c, where R-c is the fireball radius measured at an associated local time. The profile of light curves of fireballs depends only on the relative timescale, entirely independent of the real timescale and the real size of the objects. It displays in detail how a cutoff tail or a turnover feature ( called the cutoff tail problem) in the decay phase of a light curve can arise. This feature is a consequence of a hot spot on the fireball surface, moving toward the observer, and has been observed in a few cases previously. Local pulses suddenly dimming produce light curves bearing a certain decay form ( called a standard decay form) and exhibiting a sharp feature at their peaks. Light curves arising from gradually dimming local pulses are smooth at their peaks, and their profiles in the decay phase will obviously deviate from the standard form when the width of the local pulse is large enough. It is observed that light curves arising from relatively short local pulses should be the same, entirely independent of the local pulse shape. The impact of the rest-frame radiation form and of the variance of the form on the profile of light curves is insignificant, while the impact on the magnitude of the light curves is obvious. By performing fits to the count-rate light curves of six sample sources, we show how to obtain some physical parameters from the observed profile of the count rate of GRBs and show that there do exist some GRBs for which the profiles of their count rate light curves can be described by the formula provided. In addition, the analysis reveals that the Doppler effect of fireballs could lead to a power-law relationship between the FWHM of pulses and energy, which has been observed previously by many authors.
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
URL查看原文
归档日期2005-01-05
WOS记录号WOS:000225766700031
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]BATSE OBSERVATIONS ; RELATIVISTIC MOTION ; SPECTRAL FEATURES ; BRIGHT ; ENERGY ; SPECTROSCOPY ; CATALOG ; EMISSION ; PLASMA
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6967
专题星系研究组
通讯作者Qin, YP (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Yunnan, Peoples R China.
作者单位1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming, Yunnan 650011, China
2.Physics Department, Guangxi University, Nanning, Guangxi 530004, China
3.The Graduate School of the Chinese Academy of Sciences
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GB/T 7714
Tan YP,Zhang ZB,Zhang,FW,et al. Characteristics of profiles of gamma-ray burst pulses associated with the Doppler effect of fireballs[J]. ASTROPHYSICAL JOURNAL,2004,617(1):439-460.
APA Tan YP,Zhang ZB,Zhang,FW,Cui XH,&Qin, YP .(2004).Characteristics of profiles of gamma-ray burst pulses associated with the Doppler effect of fireballs.ASTROPHYSICAL JOURNAL,617(1),439-460.
MLA Tan YP,et al."Characteristics of profiles of gamma-ray burst pulses associated with the Doppler effect of fireballs".ASTROPHYSICAL JOURNAL 617.1(2004):439-460.
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