Statistical studies of optically dark gamma-ray bursts in the Swift era
文献类型：期刊论文
| 作者 | Zheng, Wei-Kang1,2; Deng, Jin-Song1; Wang, Jing1
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| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
 |
| 出版日期 | 2009-10-01 |
| 卷号 | 9期号:10页码:1103-1118 |
| 关键词 | gamma rays: bursts gamma rays: observations |
| 英文摘要 | We compare the properties of optically dark GRBs, defined by the optical-to-X-ray spectral index beta(OX) < 0.5, and normal ones discovered by the Swift satellite before the year 2008 in a statistical way, using data collected from the literature and online databases. Our sample includes 200 long bursts, 19 short bursts, and 10 with measured high redshifts (z greater than or similar to 4). The ratio of dark bursts is found to be similar to 10% - 20%, and is similar among long bursts, short ones, and the high-z sub-sample. The result for long bursts is consistent with both the pre-Swift sample and studies by other authors on smaller Swift samples. The existence of dark short GRBs is pointed out for the first time. The X-ray derived hydrogen column densities of dark GRBs clearly prefer large values compared with those of normal bursts. This supports the dust extinction scenario as the main cause of dark GRBs. Other possibilities like very high redshifts and non-standard emission mechanisms are less likely, although not fully excluded. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000271266300003 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7502]  |
| 专题 | 国家天文台_空间科学研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zheng, Wei-Kang,Deng, Jin-Song,Wang, Jing. Statistical studies of optically dark gamma-ray bursts in the Swift era[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2009,9(10):1103-1118. |
| APA | Zheng, Wei-Kang,Deng, Jin-Song,&Wang, Jing.(2009).Statistical studies of optically dark gamma-ray bursts in the Swift era.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,9(10),1103-1118. |
| MLA | Zheng, Wei-Kang,et al."Statistical studies of optically dark gamma-ray bursts in the Swift era".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 9.10(2009):1103-1118. |
入库方式： OAI收割
来源：国家天文台
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