NAOC Open IR
High-redshift Extreme Variability Quasars from Sloan Digital Sky Survey Multiepoch Spectroscopy
Guo, Hengxiao1,2,3; Peng, Jiacheng4; Zhang, Kaiwen5; Burke, Colin J.1,2; Liu, Xin1,2; Sun, Mouyuan6; Wang, Shu7,8; Kong, Minzhi4; Sheng, Zhenfeng9,10; Wang, Tinggui9,10; He, Zhicheng9,10; Gu, Minfeng11
2020-12-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume905Issue:1Pages:19
AbstractWe perform a systematic search for high-redshift (z > 1.5) extreme variability quasars (EVQs) using repeat spectra from the Sixteenth Data Release of the Sloan Digital Sky Survey, which provides a baseline spanning up to similar to 18 yr in the observed frame. We compile a sample of 348 EVQs with a maximum continuum variability at rest frame 1450 A of more than 100% (i.e., delta V equivalent to (Max - Min)/Mean > 1). The EVQs show a range of emission-line variability, including 23 where at least one line in our redshift range disappears below detectability, which can then be seen as analogous to low-redshift changing-look quasars (CLQs). Importantly, spurious CLQs caused by problematic SDSS spectral flux calibration, e.g., fiber-drop issue, have been rejected. The similar properties (e.g., continuum/line, difference-composite spectra and Eddington ratio) of normal EVQs and CLQs imply that they are basically the same physical population with analogous intrinsic variability mechanisms, as a tail of a continuous distribution of normal quasar properties. In addition, we find no reliable evidence (less than or similar to 1 sigma) to support that CLQs are a subset of EVQs with less efficient accretion. Finally, we also confirm the antibreathing of C IV (i.e., the line width increases as luminosity increases) in EVQs and find that in addition to the similar to 0.4 dex systematic uncertainty in single-epoch C IV virial black hole mass estimates, an extra scatter of similar to 0.3 dex will be introduced by extreme variability.
KeywordActive galactic nuclei Quasars black hole physics Spectroscopy Time domain astronomy
Funding OrganizationNSF ; NSF ; Illinois graduate survey science fellowship ; Illinois graduate survey science fellowship ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; USTC Research Funds of the Double First-Class Initiative ; USTC Research Funds of the Double First-Class Initiative ; NSFC ; NSFC ; CAS ; CAS ; Natural Science Foundation of Hebei Province ; Natural Science Foundation of Hebei Province ; NSF ; NSF ; Illinois graduate survey science fellowship ; Illinois graduate survey science fellowship ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; USTC Research Funds of the Double First-Class Initiative ; USTC Research Funds of the Double First-Class Initiative ; NSFC ; NSFC ; CAS ; CAS ; Natural Science Foundation of Hebei Province ; Natural Science Foundation of Hebei Province ; NSF ; NSF ; Illinois graduate survey science fellowship ; Illinois graduate survey science fellowship ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; USTC Research Funds of the Double First-Class Initiative ; USTC Research Funds of the Double First-Class Initiative ; NSFC ; NSFC ; CAS ; CAS ; Natural Science Foundation of Hebei Province ; Natural Science Foundation of Hebei Province ; NSF ; NSF ; Illinois graduate survey science fellowship ; Illinois graduate survey science fellowship ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; USTC Research Funds of the Double First-Class Initiative ; USTC Research Funds of the Double First-Class Initiative ; NSFC ; NSFC ; CAS ; CAS ; Natural Science Foundation of Hebei Province ; Natural Science Foundation of Hebei Province
DOI10.3847/1538-4357/abc2ce
WOS KeywordBLACK-HOLE MASSES ; OPTIMALLY EMITTING CLOUDS ; SPECTRAL VARIABILITY ; EDDINGTON RATIO ; LINE ; EMISSION ; AGN ; SELECTION ; DYNAMICS ; NGC-5548
Language英语
Funding ProjectNSF[AST-1907290] ; Illinois graduate survey science fellowship ; National Natural Science Foundation of China[NSFC-11973002] ; USTC Research Funds of the Double First-Class Initiative ; NSFC[U1831126] ; CAS[U1831126] ; Natural Science Foundation of Hebei Province[A2019205100] ; [NSFC-11903031] ; [NSFC-11833007] ; [NSFC-11873073]
Funding OrganizationNSF ; NSF ; Illinois graduate survey science fellowship ; Illinois graduate survey science fellowship ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; USTC Research Funds of the Double First-Class Initiative ; USTC Research Funds of the Double First-Class Initiative ; NSFC ; NSFC ; CAS ; CAS ; Natural Science Foundation of Hebei Province ; Natural Science Foundation of Hebei Province ; NSF ; NSF ; Illinois graduate survey science fellowship ; Illinois graduate survey science fellowship ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; USTC Research Funds of the Double First-Class Initiative ; USTC Research Funds of the Double First-Class Initiative ; NSFC ; NSFC ; CAS ; CAS ; Natural Science Foundation of Hebei Province ; Natural Science Foundation of Hebei Province ; NSF ; NSF ; Illinois graduate survey science fellowship ; Illinois graduate survey science fellowship ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; USTC Research Funds of the Double First-Class Initiative ; USTC Research Funds of the Double First-Class Initiative ; NSFC ; NSFC ; CAS ; CAS ; Natural Science Foundation of Hebei Province ; Natural Science Foundation of Hebei Province ; NSF ; NSF ; Illinois graduate survey science fellowship ; Illinois graduate survey science fellowship ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; USTC Research Funds of the Double First-Class Initiative ; USTC Research Funds of the Double First-Class Initiative ; NSFC ; NSFC ; CAS ; CAS ; Natural Science Foundation of Hebei Province ; Natural Science Foundation of Hebei Province
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000598109400001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/80099
Collection中国科学院国家天文台
Corresponding AuthorGuo, Hengxiao; Kong, Minzhi
Affiliation1.Univ Illinois, Dept Astron, Urbana, IL 61801 USA
2.Univ Illinois, Natl Ctr Supercomp Applicat, Urbana, IL 61801 USA
3.Univ Calif Irvine, Dept Phys & Astron, 4129 Frederick Reines Hall, Irvine, CA 92697 USA
4.Hebei Normal Univ, Dept Phys, 20 East South 2nd Ring Rd, Shijiazhuang 050024, Hebei, Peoples R China
5.Univ Illinois, Dept Phys, 1110 West Green St, Urbana, IL 61801 USA
6.Xiamen Univ, Dept Astron, Xiamen 361005, Fujian, Peoples R China
7.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
8.Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China
9.Univ Sci & Technol China, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China
10.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Peoples R China
11.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China
Recommended Citation
GB/T 7714
Guo, Hengxiao,Peng, Jiacheng,Zhang, Kaiwen,et al. High-redshift Extreme Variability Quasars from Sloan Digital Sky Survey Multiepoch Spectroscopy[J]. ASTROPHYSICAL JOURNAL,2020,905(1):19.
APA Guo, Hengxiao.,Peng, Jiacheng.,Zhang, Kaiwen.,Burke, Colin J..,Liu, Xin.,...&Gu, Minfeng.(2020).High-redshift Extreme Variability Quasars from Sloan Digital Sky Survey Multiepoch Spectroscopy.ASTROPHYSICAL JOURNAL,905(1),19.
MLA Guo, Hengxiao,et al."High-redshift Extreme Variability Quasars from Sloan Digital Sky Survey Multiepoch Spectroscopy".ASTROPHYSICAL JOURNAL 905.1(2020):19.
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