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Discovery of Variable Hydrogen Balmer Absorption Lines with Inverse Decrement in PG 1411+442
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; Shi, Xi-Heng(Polar Res Inst China, Jinqiao Rd 451, Shanghai 200136, Peoples R China)
发表期刊ASTROPHYSICAL JOURNAL LETTERS
2017-07-01
卷号843期号:1
DOI10.3847/2041-8213/aa725e
产权排序第3完成单位
收录类别SCI
关键词Accretion Accretion Disks Quasars: Absorption Lines Quasars: Individual (Pg 1411+442)
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.
项目资助者National Basic Research Program of China (the 973 Program)(2013CB834905) ; National Natural Science Foundation of China(NSFC11473025, 11503022, 11573024) ; National Astronomical Observatories of China ; Chinese Academy of Sciences (the Strategic Priority Research Program " The Emergence of Cosmological Structures")(XDB09000000) ; Special Fund for Astronomy from the Ministry of Finance
语种英语
学科领域天文学
文章类型Article
ISSN2041-8205
URL查看原文
WOS记录号WOS:000404731200005
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]ACTIVE GALACTIC NUCLEI ; ACCRETION DISKS ; QUASAR ; VARIABILITY ; OUTFLOW
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被引频次:1[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/114a53/10152
专题高能天体物理研究组
通讯作者Shi, Xi-Heng(Polar Res Inst China, Jinqiao Rd 451, Shanghai 200136, Peoples R China)
作者单位1.Polar Research Institute of China, Jinqiao Road 451, Shanghai 200136, China
2.Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Chinese Academy of Sciences, Hefei, Anhui 230026, China
3.Yunnan Observatories, Chinese Academy of Sciences, Kunming, Yunnan 650011, China
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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.,...&Shi, Xi-Heng.(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).
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