Detection of GRB 060927 at z=5.47: Implications for the use of gamma-ray bursts as probes of the end of the dark ages
文献类型：期刊论文
| 作者 | Ruiz-Velasco, A. E.; Swan, H.; Troja, E.; Malesani, D.; Fynbo, J. P. U.; Starling, R. L. C.; Xu, D. ; Aharonian, F.; Akerlof, C.; Andersen, M. I.
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2007-11-01 |
| 卷号 | 669期号:1页码:1-9 |
| 关键词 | cosmology : observations gamma rays : bursts (GRB 060927) |
| 英文摘要 | We report on follow-up observations of the gamma-ray burst GRB 060927 using the robotic ROTSE-IIIa telescope and a suite of larger aperture ground-based telescopes. An optical afterglow was detected 20 s after the burst, the earliest rest-frame detection of optical emission from any GRB. Spectroscopy performed with the VLT about 13 hr after the trigger shows a continuumbreak at lambda approximate to 8070 angstrom, produced by neutral hydrogen absorption at z approximate to 5.6. We also detect an absorption line at 8158 angstrom, which we interpret as Si II lambda 1260 at z = 5. 467. Hence, GRB 060927 is the second most distant GRB with a spectroscopically measured redshift. The shape of the red wing of the spectral break can be fitted by a damped Ly alpha profile with a column density with log (N-H/cm(-2)) = 22-50 +/- 0.15. We discuss the implications of thiswork for the use ofGRBs as probes of the end of the dark ages and draw threemain conclusions: (1) GRB afterglows originating from z less than or similar to 6 should be relatively easy to detect from the ground, but rapid near-infrared monitoring is necessary to ensure that they are found; (2) the presence of large H I column densities in some GRB host galaxies at z > 5 makes the use of GRBs to probe the reionization epoch via spectroscopy of the red damping wing challenging; and ( 3) GRBs appear crucial to locate typical star-forming galaxies at z > 5, and therefore the type of galaxies responsible for the reionization of the universe. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000250480600001 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7314]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Univ Copenhagen, Neil Bohr Inst, Dark Cosmol Ctr, DK-2100 Copenhagen, Denmark 2.Univ Guanajuato, Dept Astron, Guanajuato 36000, Mexico 3.Univ Michigan, Ann Arbor, MI 48109 USA 4.Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England 5.INAF Ist Astrofis Spaz & Fis Cosm Sez Palermo, I-90146 Palermo, Italy 6.Univ Palermo, Sez Astron, Dipartimento Sci Fis & Astron, I-90134 Palermo, Italy 7.Max Planck Inst Kernphys, D-69117 Heidelberg, Germany 8.Inst Astrophys, D-14482 Potsdam, Germany 9.Univ New S Wales, Sch Phys, Dept Astrophys & Opt, Sydney, NSW 2052, Australia 10.NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA |
| 推荐引用方式 GB/T 7714 | Ruiz-Velasco, A. E.,Swan, H.,Troja, E.,et al. Detection of GRB 060927 at z=5.47: Implications for the use of gamma-ray bursts as probes of the end of the dark ages[J]. ASTROPHYSICAL JOURNAL,2007,669(1):1-9. |
| APA | Ruiz-Velasco, A. E..,Swan, H..,Troja, E..,Malesani, D..,Fynbo, J. P. U..,...&Zheng, W. K..(2007).Detection of GRB 060927 at z=5.47: Implications for the use of gamma-ray bursts as probes of the end of the dark ages.ASTROPHYSICAL JOURNAL,669(1),1-9. |
| MLA | Ruiz-Velasco, A. E.,et al."Detection of GRB 060927 at z=5.47: Implications for the use of gamma-ray bursts as probes of the end of the dark ages".ASTROPHYSICAL JOURNAL 669.1(2007):1-9. |
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来源：国家天文台
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