An X-Ray Luminosity-dependent “Changing-look” Phenomenon in UGC 3223
文献类型：期刊论文
| 作者 | Wang,J.1,2; Xu,D. W.2,3; Wei,J. Y.2,3 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2020-09-01 |
| 卷号 | 901期号:1 |
| 关键词 | Active galactic nuclei X-ray active galactic nuclei Seyfert galaxies |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/abaa48 |
| 英文摘要 | Abstract The nature of the rare “Changing-look” (CL) phenomenon in active galactic nuclei (AGNs) is still under debate. We present Swift/XRT and UVOT follow-up observations of UGC 3223, a newly discovered repeat CL-AGN with type transitions of S1.5?→?S2?→?S1.8 occurring in a period of about 30 yr. By comparing the values previously reported in the ROSAT All-sky Survey and in the second Swift-XRT Point Source catalog, we clearly find that the X-ray flux tightly follows the optical spectral transition, in which a spectral type closer to a Seyfert 1 type is associated with a higher X-ray flux. An invariable X-ray spectral shape is, however, found in the CL phenomenon of the object. An extremely low Eddington ratio of ～2?×?10?4 can be obtained from the X-ray luminosity for its Seyfert 2 state, which suggests the disk-wind broad-line region model best explains the CL phenomenon. A variation of the total UV emission is not revealed when compared to the previous Galaxy Evolution Explorer NUV observation, since the UVOT images indicate that ～90% UV emission comes from intensive star formation in the host galaxy. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-901-1-ABAA48 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/57533]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science and Technology, Guangxi University, Nanning 530004, People's Republic of China; wj@nao.cas.cn 2.Key Laboratory of Space Astronomy and Technology, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China; dwxu@nao.cas.cn 3.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing, People's Republic of China |
| 推荐引用方式 GB/T 7714 | Wang,J.,Xu,D. W.,Wei,J. Y.. An X-Ray Luminosity-dependent “Changing-look” Phenomenon in UGC 3223[J]. The Astrophysical Journal,2020,901(1). |
| APA | Wang,J.,Xu,D. W.,&Wei,J. Y..(2020).An X-Ray Luminosity-dependent “Changing-look” Phenomenon in UGC 3223.The Astrophysical Journal,901(1). |
| MLA | Wang,J.,et al."An X-Ray Luminosity-dependent “Changing-look” Phenomenon in UGC 3223".The Astrophysical Journal 901.1(2020). |
入库方式： OAI收割
来源：国家天文台
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