A Rapid and Large-amplitude X-Ray Dimming Event in a z approximate to 2.6 Radio-quiet Quasar | |
Liu, Hezhen2,3,4; Luo, B.2,4; Brandt, W. N.3,5,6; Huang, Jian2,4; Pu, Xingting7; Yi WM(易卫敏)1,3; Yu, Li-Ming2,4 | |
刊名 | ASTROPHYSICAL JOURNAL |
2022-05-01 | |
卷号 | 930期号:1 |
ISSN号 | 0004-637X |
DOI | 10.3847/1538-4357/ac6265 |
产权排序 | 第7完成单位 |
文献子类 | Article |
英文摘要 | We report a dramatic, fast X-ray dimming event in a z = 2.627 radio-quiet type 1 quasar, which has an estimated supermassive black hole (SMBH) mass of 6.3 x 10(9) M (circle dot). In the high X-ray state, it showed a typical level of X-ray emission relative to its UV/optical emission. Then its 0.5-2 keV (rest-frame 1.8-7.3 keV) flux dropped by a factor of approximate to 7.6 within two rest-frame days. The dimming is associated with spectral hardening, as the 2-7 keV (rest-frame 7.3-25.4 keV) flux dropped by only 17%, and the effective power-law photon index of the X-ray spectrum changed from approximate to 2.3 to approximate to 0.9. The quasar has an infrared (IR)-to-UV spectral energy distribution and a rest-frame UV spectrum similar to those of typical quasars, and it does not show any significant long-term variability in the IR and UV/optical bands. Such an extremely fast and large-amplitude X-ray variability event has not been reported before in luminous quasars with such massive SMBHs. The X-ray dimming is best explained by a fast-moving absorber crossing the line of sight and fully covering the X-ray emitting corona. Adopting a conservatively small size of 5 GM (BH)/c (2) for the X-ray corona, the transverse velocity of the absorber is estimated to be approximate to 0.9c. The quasar is likely accreting with a high or even super-Eddington accretion rate, and the high-velocity X-ray absorber is probably related to a powerful accretion-disk wind. Such an energetic wind may eventually evolve into a massive galactic-scale outflow, providing efficient feedback to the host galaxy. |
学科主题 | 天文学 ; 天体物理学 ; 高能天体物理学 ; 星系与宇宙学 |
URL标识 | 查看原文 |
出版地 | TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND |
资助项目 | National Natural Science Foundation of China[11991053] ; China Manned Space Project[CMS-CSST-2021-A05] ; China Manned Space Project[CMS-CSST-2021-A06] ; China Scholarships Council[201906190104] ; V.M. Willaman Endowment |
WOS关键词 | DIGITAL SKY SURVEY ; BLACK-HOLES ; POWERFUL OUTFLOWS ; ABSORPTION-LINES ; VARIABILITY ; AGN ; ACCRETION ; EMISSION ; SUPER ; ULTRAVIOLET |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | IOP Publishing Ltd |
WOS记录号 | WOS:000790553600001 |
资助机构 | National Natural Science Foundation of China[11991053] ; China Manned Space Project[CMS-CSST-2021-A05, CMS-CSST-2021-A06] ; China Scholarships Council[201906190104] ; V.M. Willaman Endowment |
内容类型 | 期刊论文 |
版本 | 出版稿 |
源URL | [http://ir.ynao.ac.cn/handle/114a53/25108] |
专题 | 云南天文台_丽江天文观测站(南方基地) |
通讯作者 | Liu, Hezhen |
作者单位 | 1.Yunnan Observatories, Chinese Academy of Sciences, Kunming, 650216, People's Republic of China 2.School of Astronomy and Space Science, Nanjing University, Nanjing, Jiangsu 210093, People's Republic of China; 3.Department of Astronomy & Astrophysics, 525 Davey Lab, The Pennsylvania State University, University Park, PA 16802, USA; 4.Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210093, People's Republic of China; 5.Institute for Gravitation and the Cosmos, The Pennsylvania State University, University Park, PA 16802, USA; 6.Department of Physics, 104 Davey Lab, The Pennsylvania State University, University Park, PA 16802, USA; 7.College of Science, Nanjing Forestry University, Nanjing, Jiangsu 210037, People's Republic of China; |
推荐引用方式 GB/T 7714 | Liu, Hezhen,Luo, B.,Brandt, W. N.,et al. A Rapid and Large-amplitude X-Ray Dimming Event in a z approximate to 2.6 Radio-quiet Quasar[J]. ASTROPHYSICAL JOURNAL,2022,930(1). |
APA | Liu, Hezhen.,Luo, B..,Brandt, W. N..,Huang, Jian.,Pu, Xingting.,...&Yu, Li-Ming.(2022).A Rapid and Large-amplitude X-Ray Dimming Event in a z approximate to 2.6 Radio-quiet Quasar.ASTROPHYSICAL JOURNAL,930(1). |
MLA | Liu, Hezhen,et al."A Rapid and Large-amplitude X-Ray Dimming Event in a z approximate to 2.6 Radio-quiet Quasar".ASTROPHYSICAL JOURNAL 930.1(2022). |
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