| 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.
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| 发表期刊 | PHYSICAL REVIEW D
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| 2006-09 | |
| 卷号 | 74期号:6 |
| DOI | 10.1103/PhysRevD.74.063005 |
| 产权排序 | 第2完成单位 |
| 收录类别 | SCI |
| 摘要 | We 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. |
| 语种 | 英语 |
| 学科领域 | Astronomy & Astrophysics ; Physics |
| 文章类型 | Article |
| ISSN | 1550-7998 |
| URL | 查看原文 |
| WOS记录号 | WOS:000240874500009 |
| WOS研究方向 | Astronomy & Astrophysics ; Physics |
| WOS类目 | Astronomy & Astrophysics ; Physics, Particles & Fields |
| 关键词[WOS] | SPECTRAL EVOLUTION ; PULSE-WIDTH ; RELATIVISTIC MOTION ; LIGHT CURVES ; ENERGY ; FIREBALLS ; BATSE ; EMISSION ; LAGS ; FEATURES |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/7001 |
| 专题 | 星系研究组 |
| 通讯作者 | Qin, YP (reprint author), Guangzhou Univ, Ctr Astrophys, Guangzhou 510006, Peoples R China. |
| 作者单位 | 1.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 |
| 第一作者单位 | 中国科学院云南天文台 |
| 推荐引用方式 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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| Hardness ratio evolu（1103KB） | 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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