The correlations between optical/UV broad lines and X-ray emission for a large sample of quasars
文献类型:期刊论文
作者 | Timlin, John D., II1; Brandt, W. N.1,2,3; Ni, Q.1; Luo, B.4,5; Pu, Xingting4,6; Schneider, D. P.1,2; Vivek, M.1; Yi WM(易卫敏)1,7,8 |
刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY |
出版日期 | 2020-02-01 |
卷号 | 492期号:1页码:719-741 |
ISSN号 | 0035-8711 |
关键词 | galaxies: active quasars: emission lines quasars: general X-rays: general |
DOI | 10.1093/mnras/stz3433 |
产权排序 | 第7完成单位 |
文献子类 | Article |
英文摘要 | We present Chandra observations of 2106 radio-quiet quasars in the redshift range 1.7 <= z <= 2.7 from the Sloan Digital Sky Survey (SDSS), through data release 14 (DR14), that do not contain broad absorption lines in their rest-frame ultraviolet (UV) spectra. This sample adds over a decade worth of SDSS and Chandra observations to our previously published sample of 139 quasars from SDSS DR5 that is still used to correlate X-ray and optical/UV emission in typical quasars. We fit the SDSS spectra for 753 of the quasars in our sample that have high-quality (exposure time >= 10 ks and off-axis observation angle <= 10 arcmin) X-ray observations, and analyse their X-ray-to-optical spectral energy distribution properties (alpha(ox) and Delta alpha(ox)) with respect to the measured C IV and MgII emission-line rest-frame equivalent width (EW) and the C IV emission-line blueshift. We find significant correlations (at the >= 99.99 per cent level) between alpha(ox) and these emission-line parameters, as well as between Delta alpha(ox) and C IV EW. Slight correlations are found between Delta alpha(ox) and C IV blueshift, Mg II EW, and the C IV EW to Mg II EW ratio. The best-fitting trend in each parameter space is used to compare the X-ray weakness (Delta alpha(ox)) and optical/UV emission properties of typical quasars and weak-line quasars (WLQs). The WLQs typically exhibit weaker X-ray emission than predicted by the typical quasar relationships. The best-fitting relationships for our typical quasars are consistent with predictions from the disc-wind quasar model. The behaviour of the WLQs compared to our typical quasars can be explained by an X-ray 'shielding' model. |
学科主题 | 天文学 ; 星系与宇宙学 |
URL标识 | 查看原文 |
出版地 | GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND |
WOS关键词 | DIGITAL-SKY-SURVEY ; SUPERMASSIVE BLACK-HOLES ; ACTIVE GALACTIC NUCLEI ; CONFIDENCE-LIMITS ; ABSORPTION-LINE ; DATA RELEASE ; DISK WINDS ; C IV ; ACCRETION ; SPECTRA |
资助项目 | NASA ADP grant[80NSSC18K0878] ; Chandra X-ray Center[G08-19076X] ; V. M. Willaman Endowment ; Penn State ACIS Instrument Team Contract by the Chandra Xray Center[SV4-74018] ; NASA[NAS8-03060] ; National Key R&D Program of China[2016YFA0400702] ; National Natural Science Foundation of China[11673010] ; Natural Science Foundation of Jiangsu Province[BK20150870] ; National Science Foundation of China (NSFC)[11703076] ; West Light Foundation of the Chinese Academy of Sciences[Y6XB016001] ; [SV2-82024] |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | OXFORD UNIV PRESS |
WOS记录号 | WOS:000512329900057 |
资助机构 | NASA ADP grant[80NSSC18K0878] ; Chandra X-ray Center[G08-19076X] ; V. M. Willaman Endowment ; Penn State ACIS Instrument Team Contract by the Chandra Xray Center[SV4-74018] ; NASA[NAS8-03060] ; National Key R&D Program of China[2016YFA0400702] ; National Natural Science Foundation of China[11673010] ; Natural Science Foundation of Jiangsu Province[BK20150870] ; National Science Foundation of China (NSFC)[11703076] ; West Light Foundation of the Chinese Academy of Sciences[Y6XB016001] ; [SV2-82024] |
源URL | [http://ir.ynao.ac.cn/handle/114a53/22411] |
专题 | 云南天文台_丽江天文观测站(南方基地) 云南天文台_中国科学院天体结构与演化重点实验室 |
通讯作者 | Timlin, John D., II |
作者单位 | 1.Department of Astronomy & Astrophysics, The Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, USA 2.Institute for Gravitation and the Cosmos, The Pennsylvania State University, University Park, PA 16802, USA 3.Department of Physics, The Pennsylvania State University, 104 Davey Lab, University Park, PA 16802, USA 4.School of Astronomy and Space Science, Nanjing University, Nanjing, Jiangsu 210093, China 5.Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing, Jiangsu 210093, China 6.College of Science, Nanjing Forestry University, Nanjing, Jiangsu 210037, China 7.Yunnan Observatories, Kunming 650216, China 8.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, China Accepted 2019 |
推荐引用方式 GB/T 7714 | Timlin, John D., II,Brandt, W. N.,Ni, Q.,et al. The correlations between optical/UV broad lines and X-ray emission for a large sample of quasars[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2020,492(1):719-741. |
APA | Timlin, John D., II.,Brandt, W. N..,Ni, Q..,Luo, B..,Pu, Xingting.,...&Yi WM.(2020).The correlations between optical/UV broad lines and X-ray emission for a large sample of quasars.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,492(1),719-741. |
MLA | Timlin, John D., II,et al."The correlations between optical/UV broad lines and X-ray emission for a large sample of quasars".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 492.1(2020):719-741. |
入库方式: OAI收割
来源:云南天文台
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