| ENERGY-DEPENDENT GAMMA-RAY BURST PULSE WIDTH DUE TO THE CURVATURE EFFECT AND INTRINSIC BAND SPECTRUM | |
Peng, ZY1,2; Zhao XH(赵晓红)2,3 ; Yin, Y4; Bao, YY5; Ma, L1; Peng, ZY (reprint author), Yunnan Normal Univ, Dept Phys, Kunming 650092, Peoples R China.
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| 发表期刊 | ASTROPHYSICAL JOURNAL
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| 2012-06-20 | |
| 卷号 | 752期号:2 |
| DOI | 10.1088/0004-637X/752/2/132 |
| 产权排序 | 第3完成单位 |
| 收录类别 | SCI |
| 关键词 | Gamma-ray Burst: General Methods: Statistical |
| 摘要 | Previous studies have found that the width of the gamma-ray burst (GRB) pulse is energy dependent and that it decreases as a power-law function with increasing photon energy. In this work we have investigated the relation between the energy dependence of the pulse and the so-called Band spectrum by using a sample including 51 well-separated fast rise and exponential decay long-duration GRB pulses observed by BATSE (Burst and Transient Source Experiment on the Compton Gamma Ray Observatory). We first decompose these pulses into rise and decay phases and find that the rise widths and the decay widths also behave as a power-law function with photon energy. Then we investigate statistically the relations between the three power-law indices of the rise, decay, and total width of the pulse (denoted as delta(r), delta(d), and delta(w), respectively) and the three Band spectral parameters, high-energy index (alpha), low-energy index (beta), and peak energy (E-p). It is found that (1) alpha is strongly correlated with delta(w) and delta(d) but seems uncorrelated with delta(r); (2) beta is weakly correlated with the three power-law indices, and (3) E-p does not show evident correlations with the three power-law indices. We further investigate the origin of delta(d)-alpha and delta(w)-alpha. We show that the curvature effect and the intrinsic Band spectrum could naturally lead to the energy dependence of the GRB pulse width and also the delta(d)-alpha and delta(w)-alpha correlations. Our results hold so long as the shell emitting gamma rays has a curved surface and the intrinsic spectrum is a Band spectrum or broken power law. The strong delta(d)-alpha correlation and inapparent correlations between delta(r) and the three Band spectral parameters also suggest that the rise and decay phases of the GRB pulses have different origins. |
| 项目资助者 | Yunnan Natural Science Foundation [2009ZC060M, 2011FB115] ; Key Program for the Science Fund of the Education Department of Yunnan Province [2011Z004] ; Open Research Program of the Key Laboratory for the Structure and Evolution of Celestial Objects [OP201106] ; West Light Foundation of the Chinese Academy of Sciences ; High-Energy Astrophysics Science and Technology Innovation Team of Yunnan Higher School ; Yunnan Gravitation Theory Innovation Team [2011C1] |
| 语种 | 英语 |
| 学科领域 | Astronomy & Astrophysics |
| 文章类型 | Article |
| ISSN | 0004-637X |
| URL | 查看原文 |
| WOS记录号 | WOS:000305738000055 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 关键词[WOS] | LONG-LAG ; X-RAY ; FAST RISE ; BATSE ; BRIGHT ; LUMINOSITY ; DURATION ; VARIABILITY ; FIREBALLS ; CATALOG |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/5420 |
| 专题 | 南方基地 中国科学院天体结构与演化重点实验室 |
| 通讯作者 | Peng, ZY (reprint author), Yunnan Normal Univ, Dept Phys, Kunming 650092, Peoples R China. |
| 作者单位 | 1.Department of Physics, Yunnan Normal University, Kunming 650092, China 2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China 3.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, China 4.Department of Physics, Liupanshui Normal College, Liupanshui 553004, China 5.Department of Physics, Yuxi Normal College, Yuxi 653100, China |
| 推荐引用方式 GB/T 7714 | Peng, ZY,Zhao XH,Yin, Y,et al. ENERGY-DEPENDENT GAMMA-RAY BURST PULSE WIDTH DUE TO THE CURVATURE EFFECT AND INTRINSIC BAND SPECTRUM[J]. ASTROPHYSICAL JOURNAL,2012,752(2). |
| APA | Peng, ZY,Zhao XH,Yin, Y,Bao, YY,Ma, L,&Peng, ZY .(2012).ENERGY-DEPENDENT GAMMA-RAY BURST PULSE WIDTH DUE TO THE CURVATURE EFFECT AND INTRINSIC BAND SPECTRUM.ASTROPHYSICAL JOURNAL,752(2). |
| MLA | Peng, ZY,et al."ENERGY-DEPENDENT GAMMA-RAY BURST PULSE WIDTH DUE TO THE CURVATURE EFFECT AND INTRINSIC BAND SPECTRUM".ASTROPHYSICAL JOURNAL 752.2(2012). |
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| ENERGY-DEPENDENT GAM（592KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | 浏览 请求全文 | |
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