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Unsaturated low-ionization broad absorption lines in the quasar SDSS J144842.45+042403.1
Lu, HL1,2; Wang, TG1,2; Yuan WM(袁为民)3; Dou, LM3; Ge, J4; Zhou, HY1,2,4; Wang, HY1,2,4; Dong, XB1,2; Lu, HL (reprint author), Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Anhui, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL
2008-06-20
卷号680期号:2页码:858-866
DOI10.1086/587792
产权排序第3完成单位
收录类别SCI
关键词Quasars : Absorption Lines Quasars : Individual (Sdss j144842.45+042403.1)
摘要We present a detailed analysis of the exceptional low-ionization broad absorption line (LoBAL) quasar SDSS J144842.45+042403.1. The C IV absorption trough, which is likely saturated, has a box-shaped bottom at a flux level of 2%-5% of the unabsorbed flux. A large fraction of at least 80% of the C IV and Fe II emission-line fluxes are obliterated by the C IV broad absorption lines (BALs), spanning 3000 km s(-1) in velocity. This indicates that the outflow intercepts most of the lines of sight to the continuum source and the broad emission line region (BELR). Therefore, the BAL region (BALR) should be located outside the BELR, and its size is no less than that of the BELR. The Al III and Mg II BAL troughs, which are well resolved, are found to be unsaturated and to show the same velocity structures. Meanwhile, their velocities largely overlap that of the C IV BAL, indicating that the LoBALs and the HiBALs (high-ionization BALs) are closely associated and most likely produced from the same outflow. The column densities of the Mg(+) and Al(2+) ions in the outflow are measured. Results from an X-ray observation performed with Chandra suggest the presence of intrinsic X-ray absorption with a hydrogen column density of 10(22)-10(23) cm(-2). The measured Mg(+) and Al(2+) column densities can be well reproduced in models with a dimensionless ionization parameter of log U > -1.5 and a total hydrogen column density of N(H) = 2.8 x 10(22)U cm(-2). A comparison of models with the observed properties also suggests that the outflow is either very highly ionized (with a high column density) or clumpy.
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
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WOS记录号WOS:000256752400003
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]DIGITAL SKY SURVEY ; X-RAY WEAK ; SPECTRAL ENERGY-DISTRIBUTION ; STELLAR OBJECTS ; DATA RELEASE ; EMISSION-LINE ; SAMPLE ; ABSORBER ; CATALOG ; MAPS
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被引频次:7[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/4962
专题高能天体物理研究组
通讯作者Lu, HL (reprint author), Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Anhui, Peoples R China.
作者单位1.Center for Astrophysics, University of Science and Technology of China, Hefei, Anhui 230026, China
2.Joint Institute of Galaxies and Cosmology, SHAO and USTC
3.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming, Yunnan 650011, China
4.Department of Astronomy, University of Florida, Gainesville, FL 32611
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Lu, HL,Wang, TG,Yuan WM,et al. Unsaturated low-ionization broad absorption lines in the quasar SDSS J144842.45+042403.1[J]. ASTROPHYSICAL JOURNAL,2008,680(2):858-866.
APA Lu, HL.,Wang, TG.,Yuan WM.,Dou, LM.,Ge, J.,...&Lu, HL .(2008).Unsaturated low-ionization broad absorption lines in the quasar SDSS J144842.45+042403.1.ASTROPHYSICAL JOURNAL,680(2),858-866.
MLA Lu, HL,et al."Unsaturated low-ionization broad absorption lines in the quasar SDSS J144842.45+042403.1".ASTROPHYSICAL JOURNAL 680.2(2008):858-866.
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