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Connecting Low- and High-redshift Weak Emission-line Quasars via Hubble Space Telescope Spectroscopy of Ly alpha Emission
Paul, Jeremiah D.1; Plotkin, Richard M.1; Shemmer, Ohad2; Anderson, Scott F.3; Brandt, W. N.4,5,6; Fan, Xiaohui7; Gallo, Elena8; Luo, Bin9,10; Ni, Qingling4,5,11; Richards, Gordon T.12; Schneider, Donald P.4,5; Wu, Jianfeng13; Yi WM(易卫敏)4,14,15
发表期刊ASTROPHYSICAL JOURNAL
2022-04-01
卷号929期号:1
DOI10.3847/1538-4357/ac5bd6
产权排序第14完成单位
收录类别SCI
摘要

We present ultraviolet spectroscopy covering the Ly alpha + N v complex of six candidate low-redshift (0.9 < z < 1.5) weak emission-line quasars (WLQs) based on observations with the Hubble Space Telescope. The original systematic searches for these puzzling Type 1 quasars with intrinsically weak broad emission lines revealed an N approximate to 100 WLQ population from optical spectroscopy of high-redshift (z > 3) quasars, defined by a Ly alpha + N v rest-frame equivalent width (EW) threshold <15.4 angstrom. Identification of lower-redshift (z < 3) WLQ candidates, however, has relied primarily on optical spectroscopy of weak broad emission lines at longer rest-frame wavelengths. With these new observations expanding existing optical coverage into the ultraviolet, we explore unifying the low- and high-z WLQ populations via EW[Ly alpha+N v]. Two objects in the sample unify with high-z WLQs, three others appear consistent with the intermediate portion of the population connecting WLQs and normal quasars, and the final object is consistent with typical quasars. The expanded wavelength coverage improves the number of available line diagnostics for our individual targets, allowing a better understanding of the shapes of their ionizing continua. The ratio of EW[Ly alpha+N v] to EW[Mg ii] in our sample is generally small but varied, favoring a soft ionizing continuum scenario for WLQs, and we find a lack of correlation between EW[Ly alpha+N v] and the X-ray properties of our targets, consistent with a slim-disk shielding gas model. We also find indications that weak absorption may be a more significant contaminant in low-z WLQ populations than previously thought.

资助项目Chandra X-ray Center[GO0-21080X] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC)[11991053] ; China Manned Space Project[CMS-CSST-2021-A05] ; China Manned Space Project[CMS-CSST-2021-A06] ; NASANational Aeronautics & Space Administration (NASA)[NAS5-26555] ; NASA from the Space Telescope Science Institute[HST-GO-13298.001] ; Alfred P. Sloan FoundationAlfred P. Sloan Foundation ; National Science FoundationNational Science Foundation (NSF) ; U.S. Department of EnergyUnited States Department of Energy (DOE) ; National Aeronautics and Space AdministrationNational Aeronautics & Space Administration (NASA) ; Japanese MonbukagakushoMinistry of Education, Culture, Sports, Science and Technology, Japan (MEXT) ; Max Planck SocietyMax Planck SocietyFoundation CELLEX ; Higher Education Funding Council for EnglandUK Research & Innovation (UKRI)Higher Education Funding Council for England (HEFCE)
项目资助者Chandra X-ray Center[GO0-21080X] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC)[11991053] ; China Manned Space Project[CMS-CSST-2021-A05, CMS-CSST-2021-A06] ; NASANational Aeronautics & Space Administration (NASA)[NAS5-26555] ; NASA from the Space Telescope Science Institute[HST-GO-13298.001] ; Alfred P. Sloan FoundationAlfred P. Sloan Foundation ; National Science FoundationNational Science Foundation (NSF) ; U.S. Department of EnergyUnited States Department of Energy (DOE) ; National Aeronautics and Space AdministrationNational Aeronautics & Space Administration (NASA) ; Japanese MonbukagakushoMinistry of Education, Culture, Sports, Science and Technology, Japan (MEXT) ; Max Planck SocietyMax Planck SocietyFoundation CELLEX ; Higher Education Funding Council for EnglandUK Research & Innovation (UKRI)Higher Education Funding Council for England (HEFCE)
语种英语
学科领域天文学 ; 星系与宇宙学
学科门类理学 ; 理学::天文学
文章类型Article
出版者IOP Publishing Ltd
出版地TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS记录号WOS:000782505000001
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]DIGITAL-SKY-SURVEY ; BROAD-ABSORPTION-LINE ; ACTIVE GALACTIC NUCLEI ; HIGH ACCRETION RATES ; BLACK-HOLE MASSES ; X-RAY-PROPERTIES ; SPECTRA ; SPECTROGRAPH ; CONTINUUM ; GALAXIES
引用统计
被引频次:4[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
版本出版稿
条目标识符http://ir.ynao.ac.cn/handle/114a53/25049
专题南方基地
中国科学院天体结构与演化重点实验室
通讯作者Paul, Jeremiah D.
作者单位1.Department of Physics, University of Nevada, Reno, NV 89557, USA; jdpaul@nevada.unr.edu;
2.Department of Physics, University of North Texas, Denton, TX 76203, USA;
3.Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195, USA;
4.Department of Astronomy & Astrophysics, 525 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 Physics, 104 Davey Lab, The Pennsylvania State University, University Park, PA 16802, USA;
7.Steward Observatory, University of Arizona, 933 N. Cherry Ave, Tucson, AZ 85721, USA;
8.Department of Astronomy, University of Michigan, 1085 S. University Ave, Ann Arbor, MI 48109, USA;
9.School of Astronomy and Space Science, Nanjing University, Nanjing, Jiangsu 210093, People's Republic of China;
10.Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing, Jiangsu 210093, People's Republic of China;
11.Institute for Astronomy, University of Edinburgh, Royal Observatory, Edinburgh EH9 3HJ, UK;
12.Department of Physics, Drexel University, 32 S. 32nd Street, Philadelphia, PA 19104, USA;
13.Department of Astronomy, Xiamen University, Xiamen, Fujian 361005, People's Republic of China;
14.Yunnan Observatories, Kunming 650216, People's Republic of China;
15.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, People's Republic of China
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Paul, Jeremiah D.,Plotkin, Richard M.,Shemmer, Ohad,et al. Connecting Low- and High-redshift Weak Emission-line Quasars via Hubble Space Telescope Spectroscopy of Ly alpha Emission[J]. ASTROPHYSICAL JOURNAL,2022,929(1).
APA Paul, Jeremiah D..,Plotkin, Richard M..,Shemmer, Ohad.,Anderson, Scott F..,Brandt, W. N..,...&Yi WM.(2022).Connecting Low- and High-redshift Weak Emission-line Quasars via Hubble Space Telescope Spectroscopy of Ly alpha Emission.ASTROPHYSICAL JOURNAL,929(1).
MLA Paul, Jeremiah D.,et al."Connecting Low- and High-redshift Weak Emission-line Quasars via Hubble Space Telescope Spectroscopy of Ly alpha Emission".ASTROPHYSICAL JOURNAL 929.1(2022).
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