Discovery of Variable Hydrogen Balmer Absorption Lines with Inverse Decrement in PG 1411+442
文献类型：期刊论文
| 作者 | Shi, Xi-Heng1; Pan, Xiang1,2; Zhang, Shao-Hua1; Sun, Lu-Ming1,2; Wang JG(王建国)3 ; Ji, Tuo1; Yang, Chen-Wei2; Liu, Bo1,2; Jiang, Ning2; Zhou, Hong-Yan1,2
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| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
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| 出版日期 | 2017-07-01 |
| 卷号 | 843期号:1 |
| 关键词 | accretion accretion disks quasars: absorption lines quasars: individual (PG 1411+442) |
| ISSN号 | 2041-8205 |
| 产权排序 | 第3完成单位 |
| 通讯作者 | Shi, Xi-Heng(Polar Res Inst China, Jinqiao Rd 451, Shanghai 200136, Peoples R China) |
| 英文摘要 | We present new optical spectra of the well-known broad absorption line (BAL) quasar PG 1411+ 442, using the DBSP spectrograph at the Palomar 200 inch telescope in 2014 and 2017 and the YFOSC spectrograph at the Lijiang 2.4 m telescope in 2015. A blueshifted narrow absorption line system is clearly revealed in 2014 and 2015 consisting of hydrogen Balmer series and metastable He I lines. The velocity of these lines is similar to the centroid velocity of the UV BALs, suggesting that both originate from the outflow. The Balmer lines vary significantly between the two observations and vanished in 2017. They were also absent in the archived spectra obtained before 2001. The variation is thought to be driven by photoionization change. Besides, the absorption lines show inversed Balmer decrement, i.e., the apparent optical depths of higher-order Balmer absorption lines are larger than those of lower-order lines, which is inconsistent with the oscillator strengths of the transitions. We suggest that such anomalous line ratios can be naturally explained by the thermal structure of a background accretion disk, which allows the obscured part of the disk to contribute differently to the continuum flux at different wavelengths. Highresolution spectroscopic and photometric monitoring would be very useful to probe the structure of the accretion disk as well as the geometry and physical conditions of the outflow. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | 天文学 |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | ACTIVE GALACTIC NUCLEI ; ACCRETION DISKS ; QUASAR ; VARIABILITY ; OUTFLOW |
| 收录类别 | SCI |
| 原文出处 | http://stacks.iop.org/2041-8205/843/i=1/a=L14?key=crossref.210c1a3541b284387124f6bc988e0c5c |
| 语种 | 英语 |
| WOS记录号 | WOS:000404731200005 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/10152]  |
| 专题 | 云南天文台_高能天体物理研究组 |
| 作者单位 | 1.Polar Res Inst China, Jinqiao Rd 451, Shanghai 200136, Peoples R China 2.Univ Sci & Technol China, Chinese Acad Sci, Dept Astron, Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China 3.Chinese Acad Sci, Yunnan Observ, Kunming 650011, Yunnan, Peoples R China |
| 推荐引用方式 GB/T 7714 | Shi, Xi-Heng,Pan, Xiang,Zhang, Shao-Hua,et al. Discovery of Variable Hydrogen Balmer Absorption Lines with Inverse Decrement in PG 1411+442[J]. ASTROPHYSICAL JOURNAL LETTERS,2017,843(1). |
| APA | Shi, Xi-Heng.,Pan, Xiang.,Zhang, Shao-Hua.,Sun, Lu-Ming.,Wang JG.,...&Zhou, Hong-Yan.(2017).Discovery of Variable Hydrogen Balmer Absorption Lines with Inverse Decrement in PG 1411+442.ASTROPHYSICAL JOURNAL LETTERS,843(1). |
| MLA | Shi, Xi-Heng,et al."Discovery of Variable Hydrogen Balmer Absorption Lines with Inverse Decrement in PG 1411+442".ASTROPHYSICAL JOURNAL LETTERS 843.1(2017). |
入库方式： OAI收割
来源：云南天文台
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