| 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 |
| DOI | 10.1086/587792 |
| 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 |
| ISSN | 0004-637X |
| URL | 查看原文 |
| 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 |
| 引用统计 | |
| 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 |
| 推荐引用方式 GB/T 7714 | 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. |
| 条目包含的文件 | ||||||
| 文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
| Unsaturated Low-Ioni（789KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | 浏览 请求全文 | |
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。
修改评论