Dust extinctions for an unbiased sample of gamma-ray burst afterglows
文献类型：期刊论文
| 作者 | Covino, S.1; Melandri, A.1; Salvaterra, R.2; Campana, S.1; Vergani, S. D.1,3; Bernardini, M. G.1; D'Avanzo, P.1; D'Elia, V.4,5; Fugazza, D.1; Ghirlanda, G.1 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2013-06-01 |
| 卷号 | 432期号:2页码:1231-1244 |
| 关键词 | gamma-ray burst: general ISM: general |
| 英文摘要 | In this paper, we compute rest-frame extinctions for the afterglows of a sample of Swift gamma-ray bursts (GRBs) complete in redshift. The selection criteria of the sample are based on observational high-energy parameters of the prompt emission and therefore our sample should not be biased against dusty sight-lines. It is therefore expected that our inferences hold for the general population of GRBs. Our main result is that the optical/near-infrared extinction of GRB afterglows in our sample does not follow a single distribution. 87 per cent of the events are absorbed by less than 2 mag, and 50 per cent suffer from less than 0.3-0.4 mag extinction. The remaining 13 per cent of the afterglows are highly absorbed. The true percentage of GRB afterglows showing high absorption could be even higher since a fair fraction of the events without reliable redshift measurement are probably part of this class. These events may be due to highly dusty molecular clouds/star-forming regions associated with the GRB progenitor or along the afterglow line of sight, and/or due to massive dusty host galaxies. No clear evolution in the dust extinction properties is evident within the redshift range of our sample, although the largest extinctions are at z similar to 1.5-2, close to the expected peak of the star formation rate. Those events classified as dark are characterized, on average, by a higher extinction than typical events in the sample. A correlation between optical/near-infrared extinction and hydrogen-equivalent column density based on X-ray studies is shown, although the observed N-H appears to be well in excess compared to those observed in the Local Group. Dust extinction does not seem to correlate with GRB energetics or luminosity. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | TIME-DEPENDENT PHOTOIONIZATION ; GRB OPTICAL AFTERGLOWS ; X-RAY ; SWIFT-ERA ; HOST GALAXIES ; PANCHROMATIC OBSERVATIONS ; COLUMN DENSITIES ; PROMPT EMISSION ; MOLECULAR CLOUD ; STAR-FORMATION |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000319832300028 |
| 公开日期 | 2014-01-20 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/10044]  |
| 专题 | 紫金山天文台_宇宙伽马暴、中子星及相关物理研究团组 |
| 作者单位 | 1.INAF Brera Astron Observ, I-23807 Merate, LC, Italy 2.INAF IASF Milano, I-20133 Milan, Italy 3.Univ Paris Diderot, CNRS, Observ Paris, GEPI, F-92190 Meudon, France 4.INAF Rome Astron Observ, I-00040 Rome, Italy 5.ASI Sci Data Ctr, I-00044 Rome, Italy 6.Univ Ljubljana, Fac Math & Phys, Ljubljana 1000, Slovenia 7.Ctr Excellence Space Si, Ljubljana 1000, Slovenia 8.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 9.Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, DK-2100 Copenhagen, Denmark 10.Univ Paris Diderot, APC, CNRS IN2P3, CEA Irfu,Obs Paris, Sorbonne Paris Cite, France |
| 推荐引用方式 GB/T 7714 | Covino, S.,Melandri, A.,Salvaterra, R.,et al. Dust extinctions for an unbiased sample of gamma-ray burst afterglows[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2013,432(2):1231-1244. |
| APA | Covino, S..,Melandri, A..,Salvaterra, R..,Campana, S..,Vergani, S. D..,...&Tagliaferri, G..(2013).Dust extinctions for an unbiased sample of gamma-ray burst afterglows.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,432(2),1231-1244. |
| MLA | Covino, S.,et al."Dust extinctions for an unbiased sample of gamma-ray burst afterglows".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 432.2(2013):1231-1244. |
入库方式： OAI收割
来源：紫金山天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。