XMM-Newton Observations of Two Archival X-Ray Weak Type 1 Quasars: Obscuration Induced X-Ray Weakness and Variability | |
Zhang, Zijian7,8; Luo, Bin7,8; Brandt, W. N.4,5,6; Du, Pu3; Hu, Chen3; Huang, Jian7,8; Pu, Xingting2; Wang, Jian-Min3; Yi WM(易卫敏)1,6 | |
刊名 | ASTROPHYSICAL JOURNAL |
2023-09-01 | |
卷号 | 954期号:2 |
ISSN号 | 0004-637X |
DOI | 10.3847/1538-4357/ace7c2 |
产权排序 | 第8完成单位 |
文献子类 | Article |
英文摘要 | We report XMM-Newton observations of two examples of an unclassified type of X-ray weak quasars from the Pu et al. survey of X-ray weak quasars in the Chandra archive, SDSS J083116.62+321329.6 at z = 1.797 and SDSS J142339.87+042041.1 at z = 1.702. They do not belong to the known populations of X-ray weak quasars that show broad absorption lines, weak ultraviolet (UV) broad emission lines, or red optical/UV continua. Instead, they display typical quasar UV spectra and spectral energy distributions. In the XMM-Newton observations, both quasars show nominal levels of X-ray emission with typical quasar X-ray spectral shapes (power-law photon indices of 1.99-0.23+0.27 and 1.86-0.14+0.15 ), displaying strong X-ray variability compared to the archival Chandra data (variability factors of 4.0-1.4+1.6 and 9.0-3.8+7.4 in terms of the 2 keV flux density). Simultaneous optical (rest-frame UV) spectra indicate no strong variability compared to the archival spectra. Long-term optical/UV and infrared light curves do not show any substantial variability either. We consider that the X-ray weakness observed in the Chandra data is due to X-ray obscuration from a small-scale dust-free absorber, likely related to accretion-disk winds. Such X-ray weak/absorbed states are probably rare in typical quasars, and thus both targets recovered to X-ray nominal-strength states in the XMM-Newton observations. |
学科主题 | 天文学 ; 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 | The HET is a joint project of the University of Texas at Austin, Ludwig-Maximillians-Universitauml ; t Muuml ; nchen, Georg-August-Universitauml ; t Gouml ; ttingen, and the Pennsylvania State University. Funding for the Lijiang 2.4 m telescope has been provid ; University of Texas at Austin ; Pennsylvania State University ; Chinese Academy of Sciences ; People's Government of Yunnan Province |
WOS关键词 | DIGITAL SKY SURVEY ; INFRARED-SURVEY-EXPLORER ; EMISSION-LINE QUASARS ; PHL 1811 ANALOGS ; BLACK-HOLES ; ACCRETION ; INSIGHTS ; SPECTRA ; SPECTROSCOPY ; UNIFICATION |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | IOP Publishing Ltd |
WOS记录号 | WOS:001058165700001 |
资助机构 | The HET is a joint project of the University of Texas at Austin, Ludwig-Maximillians-Universitauml ; t Muuml ; nchen, Georg-August-Universitauml ; t Gouml ; ttingen, and the Pennsylvania State University. Funding for the Lijiang 2.4 m telescope has been provid ; University of Texas at Austin ; Pennsylvania State University ; Chinese Academy of Sciences ; People's Government of Yunnan Province |
内容类型 | 期刊论文 |
版本 | 出版稿 |
源URL | [http://ir.ynao.ac.cn/handle/114a53/26190] |
专题 | 云南天文台_丽江天文观测站(南方基地) |
通讯作者 | Zhang, Zijian |
作者单位 | 1.Yunnan Observatories, Chinese Academy of Sciences, Kunming, 650216, People's Republic of China 2.College of Science, Nanjing Forestry University, Nanjing, Jiangsu 210037, People's Republic of China; 3.Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Beijing 100049, People's Republic of China; 4.Department of Physics, 104 Davey Lab, The Pennsylvania State University, University Park, PA 16802, USA; 5.Institute for Gravitation and the Cosmos, The Pennsylvania State University, University Park, PA 16802, USA; 6.Department of Astronomy & Astrophysics, 525 Davey Lab, The Pennsylvania State University, University Park, PA 16802, USA; 7.Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, People's Republic of China; 8.School of Astronomy and Space Science, Nanjing University, Nanjing 210093, People's Republic of China; |
推荐引用方式 GB/T 7714 | Zhang, Zijian,Luo, Bin,Brandt, W. N.,et al. XMM-Newton Observations of Two Archival X-Ray Weak Type 1 Quasars: Obscuration Induced X-Ray Weakness and Variability[J]. ASTROPHYSICAL JOURNAL,2023,954(2). |
APA | Zhang, Zijian.,Luo, Bin.,Brandt, W. N..,Du, Pu.,Hu, Chen.,...&Yi WM.(2023).XMM-Newton Observations of Two Archival X-Ray Weak Type 1 Quasars: Obscuration Induced X-Ray Weakness and Variability.ASTROPHYSICAL JOURNAL,954(2). |
MLA | Zhang, Zijian,et al."XMM-Newton Observations of Two Archival X-Ray Weak Type 1 Quasars: Obscuration Induced X-Ray Weakness and Variability".ASTROPHYSICAL JOURNAL 954.2(2023). |
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