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A test of the power-law relationship between gamma-ray burst pulse-width ratio and energy expected in fireballs and uniform jets
Peng CY(彭朝阳)1,2; Tan YP(覃一平)1,3; Zhang BB(张彬彬)1,2; Lu RJ(陆睿静)1,2,3; Jia LW(贾兰伟)1,2; Zhang ZB(张志彬)1,2; Peng, ZY (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2006-05-21
Volume368Issue:3Pages:1351-1358
DOI10.1111/j.1365-2966.2006.10206.x
Contribution Rank第1完成单位
Indexed BySCI
KeywordRelativity Gamma-rays : Bursts Gamma-rays : Theory
AbstractA power-law relationship between the pulse width and energy of gamma-ray bursts (GRBs) has been found by many authors. Recently, under the assumption that the Doppler effect of the relativistically expanding fireball surface (or, in some papers, the curvature effect) is important, Qin et al. showed that, in most cases, this power-law relationship would exist in a certain energy range, and, within a similar range, a power-law relationship of an opposite trend between the ratio of the rising width to the decaying width and energy would be expected for the same burst. We check this prediction with two GRB samples that contain well-identified pulses. A power-law anticorrelation between the full pulse width and energy and a power-law correlation between the pulse-width ratio and energy are seen in the light curves of the majority (around 65 per cent) of bursts of the two samples within the energy range of BATSE, suggesting that these bursts probably arise from the emission associated with the shocks occurring on a relativistically expanding fireball surface. For the rest of the bursts, the relationships between these quantities had not been predicted previously. We propose considering other spectral evolutionary patterns or other radiation mechanisms such as a varying synchrotron or Comptonized spectrum to check whether the observed relationships for these bursts can also be accounted for by the Doppler model. In addition, we find that the upper limits of the width ratio for the two samples do not exceed 0.9, in agreement with what has previously been predicted by the Doppler model. The plateau/power law/plateau and the peaked features predicted and detected previously by Qin et al. are generally observed, with exceptions noticed only in a few cases. According to the distinct values of two power-law indices, alpha(FWHM) and alpha(ratio), we divide the bursts into three subsets that are located in different areas of the alpha(FWHM)-alpha(ratio) plane. We suspect that different locations of (alpha(FWHM), alpha(ratio)) might correspond to different mechanisms.
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN0035-8711
URL查看原文
Archive Date2006-12-28
WOS IDWOS:000237353000030
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordTIME PROFILES ; LIGHT CURVES ; LOCALIZATION ; VARIABILITY ; LUMINOSITY ; SIGNATURES ; EVOLUTION ; DURATION ; BEPPOSAX ; BLAZARS
Citation statistics
Cited Times:25[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/7003
Collection星系研究组
Corresponding AuthorPeng, ZY (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
Affiliation1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, Kunming 650011, China
2.The Graduate School of the Chinese Academy of Sciences, Beijing 100039, China
3.Physics Department, Guangxi University, Nanning, Guangxi 530004, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Peng CY,Tan YP,Zhang BB,et al. A test of the power-law relationship between gamma-ray burst pulse-width ratio and energy expected in fireballs and uniform jets[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2006,368(3):1351-1358.
APA Peng CY.,Tan YP.,Zhang BB.,Lu RJ.,Jia LW.,...&Peng, ZY .(2006).A test of the power-law relationship between gamma-ray burst pulse-width ratio and energy expected in fireballs and uniform jets.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,368(3),1351-1358.
MLA Peng CY,et al."A test of the power-law relationship between gamma-ray burst pulse-width ratio and energy expected in fireballs and uniform jets".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 368.3(2006):1351-1358.
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