Two New “Turn-off” Changing-look Active Galactic Nuclei and Implication on “Partially Obscured” AGNs
文献类型：期刊论文
| 作者 | Wang,J.3,4; Xu,D. W.2,3; Wang,Y.1; Zhang,J. B.1; Zheng,J.1; Wei,J. Y.2,3 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2019-12-05 |
| 卷号 | 887期号:1 |
| 关键词 | Active galactic nuclei Quasars Astrophysical masers |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab4d90 |
| 英文摘要 | Abstract We report a spectroscopic identification of two new changing-look active galactic nuclei (CL-AGNs): SDSS J104705.16+544405.8 and SDSS J120447.91+170256.8, both with a “turn-off” type transition from type-1 to type-1.8/1.9. The identification is arrived at through a follow-up spectroscopic observation of the five CL-AGNs candidates that are extracted from the sample recently released in Macleod et al. The candidates are extracted by the authors from the Sloan Digit Sky Survey Data Release 7, and are spectroscopically confirmed quasars with large amplitude variability. By compiling a sample of 26 previously identified CL-AGNs, we confirm the claim by Macleod et al. that CL-AGNs tend to be biased against a low Eddington ratio, and identify an overlap between the CL-AGNs at their dim state and the so-called intermediate-type AGNs. The overlap implies that there two populations of the intermediate-type AGNs with different origins. One is due to the torus orientation effect, and the other to the intrinsic change of the accretion rate of the central supermassive black holes. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-887-1-AB4D90 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/28655]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China 2.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing, People's Republic of China 3.Key Laboratory of Space Astronomy and Technology, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China; dwxu@bao.ac.cn 4.Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science and Technology, Guangxi University, Nanning 530004, People's Republic of China; wj@bao.ac.cn |
| 推荐引用方式 GB/T 7714 | Wang,J.,Xu,D. W.,Wang,Y.,et al. Two New “Turn-off” Changing-look Active Galactic Nuclei and Implication on “Partially Obscured” AGNs[J]. The Astrophysical Journal,2019,887(1). |
| APA | Wang,J.,Xu,D. W.,Wang,Y.,Zhang,J. B.,Zheng,J.,&Wei,J. Y..(2019).Two New “Turn-off” Changing-look Active Galactic Nuclei and Implication on “Partially Obscured” AGNs.The Astrophysical Journal,887(1). |
| MLA | Wang,J.,et al."Two New “Turn-off” Changing-look Active Galactic Nuclei and Implication on “Partially Obscured” AGNs".The Astrophysical Journal 887.1(2019). |
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来源：国家天文台
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