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A METAL-STRONG AND DUST-RICH DAMPED Ly alpha ABSORPTION SYSTEM TOWARD THE QUASAR SDSS J115705.52+615521.7
Wang JG(王建国)1,2,3,4; Zhou, HY2,5; Ge, J6; Jiang, P2,9; Lu, HL2; Prochaska, JX7; Hamann, F6; Wang, HY2; Wang, TG2; Yuan, WM8; Wang, JG (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Yunnan, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL
2012-11-20
卷号760期号:1页码:42-53
DOI10.1088/0004-637X/760/1/42
产权排序第1完成单位
收录类别SCI
关键词Galaxies: Abundances Dust Quasars: Absorption Lines Extinction Quasars: Individual (Sdss j115705.52+615521.7)
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.
项目资助者Chinese NSF [11233002, 11203022, 10973012, 11033007, 11133006, 10973034] ; SOC program [CHINARE2012-02-03] ; National Basic Research Program of (973 Program) [2009CB824800] ; NSF [NSF AST-0451407, AST-0451408, AST-0705139, AST-0709235] ; University of Florida ; CAS/SAFEA International Partnership Program for Creative Research Teams ; Alfred P. Sloan Foundation ; National Science Foundation ; US Department of Energy ; National Aeronautics and Space Administration ; Japanese Monbukagakusho ; Max Planck Society ; Higher Education Funding Council for England
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
URL查看原文
归档日期2012-11-07
WOS记录号WOS:000310922200042
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]DIGITAL-SKY-SURVEY ; GAMMA-RAY BURST ; ANGSTROM EXTINCTION BUMP ; LYMAN-BREAK GALAXIES ; 7TH DATA RELEASE ; INTERSTELLAR EXTINCTION ; MOLECULAR-HYDROGEN ; HOST GALAXIES ; MILKY-WAY ; GAS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5414
专题丽江天文观测站(南方基地)
中国科学院天体结构与演化重点实验室
通讯作者Wang, JG (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Yunnan, Peoples R China.
作者单位1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming, Yunnan 650011, China
2.Key Laboratory for Research in Galaxies and Cosmology, Department for Astronomy, The University of Sciences and Technology of China, Chinese Academy of Sciences, Hefei, Anhui 230026, China
3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
4.Graduate School of the Chinese Academy of Sciences, 19A Yuquan Road, P.O. Box 3908, Beijing 100039, China
5.Polar Research Institute of China, Jinqiao Road 451, Shanghai 200136, China
6.Astronomy Department, University of Florida, 211 Bryant Space Science Center, P.O. Box 112055, Gainesville, FL 32611, USA
7.Department of Astronomy and Astrophysics, UCO/Lick Observatory, University of California, 1156 High Street, Santa Cruz, CA 95064, USA
8.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
9.LAMOST Fellow
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Wang JG,Zhou, HY,Ge, J,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):42-53.
APA Wang JG.,Zhou, HY.,Ge, J.,Jiang, P.,Lu, HL.,...&Wang, JG .(2012).A METAL-STRONG AND DUST-RICH DAMPED Ly alpha ABSORPTION SYSTEM TOWARD THE QUASAR SDSS J115705.52+615521.7.ASTROPHYSICAL JOURNAL,760(1),42-53.
MLA Wang JG,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):42-53.
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