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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.
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2006-05-21
卷号368期号:3页码:1351-1358
DOI10.1111/j.1365-2966.2006.10206.x
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收录类别SCI
关键词Relativity Gamma-rays : Bursts Gamma-rays : Theory
摘要A 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.
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0035-8711
URL查看原文
归档日期2006-12-28
WOS记录号WOS:000237353000030
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]TIME PROFILES ; LIGHT CURVES ; LOCALIZATION ; VARIABILITY ; LUMINOSITY ; SIGNATURES ; EVOLUTION ; DURATION ; BEPPOSAX ; BLAZARS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/7003
专题星系研究组
通讯作者Peng, ZY (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
作者单位1.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
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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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