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An Intrinsic Link between Long-term UV/Optical Variations and X-Ray Loudness in Quasars
Kang, Wen-yong1,2; Wang, Jun-Xian1,2; Cai, Zhen-Yi1,2; Guo, Heng-Xiao3; Zhu, Fei-Fan1,2; Cao, Xin-Wu4,6,7; Gu, Wei-Min5,7; Yuan, Feng4,7
2018-11-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume868Issue:1Pages:7
Corresponding AuthorKang, Wen-yong(kwy0719@mail.ustc.edu.cn)
AbstractObservations have shown that the UV/optical variation amplitude of quasars depends on several physical parameters including luminosity, Eddington ratio, and possibly black hole mass. Identifying new factors which correlate with the variation is essential to probing the underlying physical processes. Combining around 10 years of quasar light curves from SDSS stripe 82 and X-ray data from Stripe 82X, we build a sample of X-ray-detected quasars to investigate the relation between UV/optical variation amplitude (sigma(rms)) and X-ray loudness. We find that quasars with more intense X-ray radiation (compared to bolometric luminosity) are more variable in the UV/optical. This correlation remains highly significant after excluding the effect of other parameters including luminosity, black hole mass, Eddington ratio, redshift, and rest frame wavelength (i.e., through partial correlation analyses). We further find that the intrinsic link between X-ray loudness and UV/optical variation is gradually more prominent on longer timescales (up to 10 yr in the observed frame), but tends to disappear at timescales <100 days. This suggests a slow and long-term underlying physical process. The X-ray reprocessing paradigm, in which the UV/optical variation is produced by variable central X-ray emission illuminating the accretion disk, is thus disfavored. This discovery points to an interesting scenario in which both the X-ray coronal heating and UV/optical variation in quasars are closely associated with magnetic disc turbulence, and the innermost disc turbulence (where coronal heating occurs) correlates with slow turbulence at larger radii (where UV/optical emission is produced).
Keywordaccretion, accretion disks galaxies: active quasars: general X-rays: galaxies
DOI10.3847/1538-4357/aae6c4
WOS KeywordSPECTRAL ENERGY-DISTRIBUTIONS ; ACTIVE GALACTIC NUCLEI ; EDDINGTON RATIO ; VARIABILITY ; SKY ; DEPENDENCE ; ACCRETION ; EMISSION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000450811800005
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/20808
Collection中国科学院紫金山天文台
Corresponding AuthorKang, Wen-yong
Affiliation1.Univ Sci & Technol China, Chinese Acad Sci, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China
2.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China
3.Univ Illinois, Dept Astron, Urbana, IL 61801 USA
4.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
5.Xiamen Univ, Dept Astron, Xiamen 361005, Fujian, Peoples R China
6.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
7.Xiamen Univ, SHAO XMU Joint Ctr Astrophys, Xiamen 361005, Fujian, Peoples R China
Recommended Citation
GB/T 7714
Kang, Wen-yong,Wang, Jun-Xian,Cai, Zhen-Yi,et al. An Intrinsic Link between Long-term UV/Optical Variations and X-Ray Loudness in Quasars[J]. ASTROPHYSICAL JOURNAL,2018,868(1):7.
APA Kang, Wen-yong.,Wang, Jun-Xian.,Cai, Zhen-Yi.,Guo, Heng-Xiao.,Zhu, Fei-Fan.,...&Yuan, Feng.(2018).An Intrinsic Link between Long-term UV/Optical Variations and X-Ray Loudness in Quasars.ASTROPHYSICAL JOURNAL,868(1),7.
MLA Kang, Wen-yong,et al."An Intrinsic Link between Long-term UV/Optical Variations and X-Ray Loudness in Quasars".ASTROPHYSICAL JOURNAL 868.1(2018):7.
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