A METAL-STRONG AND DUST-RICH DAMPED Ly alpha ABSORPTION SYSTEM TOWARD THE QUASAR SDSS J115705.52+615521.7
文献类型：期刊论文
| 作者 | Wang, Jian-Guo1,2,3,4; Zhou, Hong-Yan2,5; Ge, Jian6; Jiang, Peng2; Lu, Hong-Lin2; Prochaska, J. Xavier7; Hamann, Fred6; Wang, Hui-Yuan2; Wang, Ting-Gui2; Yuan, WeiMin8
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2012-11-20 |
| 卷号 | 760期号:1 |
| 关键词 | dust, extinction galaxies: abundances quasars: absorption lines quasars: individual (SDSS J115705.52+615521.7) |
| 英文摘要 | We report the discovery of an unusual, extremely dust-rich and metal-strong damped Ly alpha absorption system (DLA) at a redshift z(a) = 2.4596 toward the quasar SDSS J115705.52+615521.7 with an emission-line redshift z(e) = 2.5125. The quasar spectrum, taken in the Sloan Digital Sky Survey, shows a very red color and a number of metal absorption lines, including C II, Al II, Si II, Fe II, and Zn II, which are confirmed and further characterized by follow-up spectroscopy made with the Multiple Mirror Telescope. Its neutral hydrogen column density N-HI = 10(21.8 +/- 0.2) cm(-2) is among the highest values measured in quasar DLAs. The measured metal column density is N-Zn II approximate to 10(13.8) cm-2, which is about 1.5 times larger than the largest value in any previously observed quasar DLAs. We derive the extinction curve of the dusty DLA using a new technique, which is an analog of the "pair method" widely used to measure extinction curves in the Milky Way (MW). The best-fit curve is an MW-like law with a significant broad feature centered around 2175 angstrom in the rest frame of the absorber. The measured extinction A(V) approximate to 0.92 mag is unprecedentedly high in quasar DLAs. After applying an extinction correction, the i-band absolute magnitude of the quasar is as high as M-i approximate to -29.4mag, placing it as one of the most luminous quasars ever known. The large gas-phase relative abundance of [Zn/Fe] approximate to 1.0 indicates that metals are heavily depleted onto dust grains in the absorber. The dust depletion level is between that of the warm and cool clouds in the MW. This discovery is suggestive of the existence of a rare yet important population of dust-rich DLAs with both high metallicities and high column densities, which may have significant impact on the measurement of the cosmic evolution of neutral gas mass density and metallicity. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000310922200042 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6157]  |
| 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, Yunnan Observ, Kunming 650011, Yunnan, Peoples R China 2.Univ Sci & Technol China, Key Lab Res Galaxies & Cosmol, Dept Astron, Chinese Acad Sci, Hefei 230026, Anhui, Peoples R China 3.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650011, Yunnan, Peoples R China 4.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China 5.Polar Res Inst China, Shanghai 200136, Peoples R China 6.Univ Florida, Dept Astron, Gainesville, FL 32611 USA 7.Univ Calif Santa Cruz, Dept Astron & Astrophys, UCO Lick Observ, Santa Cruz, CA 95064 USA 8.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Jian-Guo,Zhou, Hong-Yan,Ge, Jian,et al. A METAL-STRONG AND DUST-RICH DAMPED Ly alpha ABSORPTION SYSTEM TOWARD THE QUASAR SDSS J115705.52+615521.7[J]. ASTROPHYSICAL JOURNAL,2012,760(1). |
| APA | Wang, Jian-Guo.,Zhou, Hong-Yan.,Ge, Jian.,Jiang, Peng.,Lu, Hong-Lin.,...&Yuan, WeiMin.(2012).A METAL-STRONG AND DUST-RICH DAMPED Ly alpha ABSORPTION SYSTEM TOWARD THE QUASAR SDSS J115705.52+615521.7.ASTROPHYSICAL JOURNAL,760(1). |
| MLA | Wang, Jian-Guo,et al."A METAL-STRONG AND DUST-RICH DAMPED Ly alpha ABSORPTION SYSTEM TOWARD THE QUASAR SDSS J115705.52+615521.7".ASTROPHYSICAL JOURNAL 760.1(2012). |
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来源：国家天文台
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