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Hardness ratio evolutionary curves of gamma-ray bursts expected by the curvature effect
Tan YP(覃一平)1,2,3; Su CY(苏成悦)2,4; Fan, JH1; A. C. Gupta2,5; Qin, YP (reprint author), Guangzhou Univ, Ctr Astrophys, Guangzhou 510006, Peoples R China.
Source PublicationPHYSICAL REVIEW D
2006-09
Volume74Issue:6
DOI10.1103/PhysRevD.74.063005
Contribution Rank第2完成单位
Indexed BySCI
AbstractWe have investigated the gamma-ray bursts (GRBs) pulses with a fast rise and an exponential decay phase, assumed to arise from relativistically expending fireballs, and found that the curvature effect influences the evolutionary curve of the corresponding hardness ratio (hereafter HRC). We find, due to the curvature effect, the evolutionary curve of the pure hardness ratio (when the background count is not included) would peak at the very beginning of the curve, and then would undergo a drop-to-rise-to-decay phase. In the case of the raw hardness ratio (when the background count is included), the curvature effect would give rise to several types of evolutionary curve, depending on the hardness of a burst. For a soft burst, an upside down pulse of its raw HRC would be observed; for a hard burst, its raw HRC shows a pulselike profile with a sinkage in its decaying phase; for a very hard burst, the raw HRC possesses a pulselike profile without a sinkage in its decaying phase. For a pulselike raw HRC as shown in the case of the hard and very hard bursts, its peak would appear in advance of that of the corresponding light curve, which was observed previously in some GRBs. For illustration, we have studied here the HRC of GRB 920216, GRB 920830, and GRB 990816 in detail. The features of the raw HRC expected in the hard burst are observed in these bursts. A fit to the three bursts shows that the curvature effect alone could indeed account for the predicted characteristics of HRCs. In addition, we find that the observed hardness ratio tends to be harder at the beginning of the pulses than what the curvature effect could predict and be softer at the late time of the pulses. We believe this is an evidence showing the existence of intrinsic hard-to-soft radiation which might be due to the acceleration-to-deceleration mode of shocks.
Language英语
Subject AreaAstronomy & Astrophysics ; Physics
SubtypeArticle
ISSN1550-7998
URL查看原文
WOS IDWOS:000240874500009
WOS Research AreaAstronomy & Astrophysics ; Physics
WOS SubjectAstronomy & Astrophysics ; Physics, Particles & Fields
WOS KeywordSPECTRAL EVOLUTION ; PULSE-WIDTH ; RELATIVISTIC MOTION ; LIGHT CURVES ; ENERGY ; FIREBALLS ; BATSE ; EMISSION ; LAGS ; FEATURES
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Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/7001
Collection星系研究组
Corresponding AuthorQin, YP (reprint author), Guangzhou Univ, Ctr Astrophys, Guangzhou 510006, Peoples R China.
Affiliation1.Center for Astrophysics, Guangzhou University, Guangzhou 510006, People’s Republic of China
2.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, People’s Republic of China
3.Physics Department, Guangxi University, Nanning 530004, People’s Republic of China
4.Department of Physics, Guangdong Industry University, Guangzhou 530004, People’s Republic of China
5.Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, India
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Tan YP,Su CY,Fan, JH,et al. Hardness ratio evolutionary curves of gamma-ray bursts expected by the curvature effect[J]. PHYSICAL REVIEW D,2006,74(6).
APA Tan YP,Su CY,Fan, JH,A. C. Gupta,&Qin, YP .(2006).Hardness ratio evolutionary curves of gamma-ray bursts expected by the curvature effect.PHYSICAL REVIEW D,74(6).
MLA Tan YP,et al."Hardness ratio evolutionary curves of gamma-ray bursts expected by the curvature effect".PHYSICAL REVIEW D 74.6(2006).
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