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EUCLIA-Exploring the UV/Optical Continuum Lag in Active Galactic Nuclei. I. A Model without Light Echoing
Cai, Zhen-Yi1,2; Wang, Jun-Xian1,2; Zhu, Fei-Fan1,2,3; Sun, Mou-Yuan1,2; Gu, Wei-Min4,5; Cao, Xin-Wu5,6,7; Yuan, Feng5,6
2018-03-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume855Issue:2Pages:17
Corresponding AuthorCai, Zhen-Yi(zcai@ustc.edu.cn)
AbstractThe tight interband correlation and the lag-wavelength relation among UV/optical continua of active galactic nuclei have been firmly established. They are usually understood within the widespread reprocessing scenario; however, the implied interband lags are generally too small. Furthermore, it is challenged by new evidence, such as that the X-ray reprocessing yields too much high-frequency UV/optical variation and that it fails to reproduce the observed timescale-dependent color variations among the Swift light curves of NGC 5548. In a different manner, we demonstrate that an upgraded inhomogeneous accretion disk model, whose local independent temperature fluctuations are subject to a speculated common large-scale temperature fluctuation, can intrinsically generate the tight interband correlation and lag across the UV/optical and be in nice agreement with several observational properties of NGC 5548, including the timescale-dependent color variation. The emergent lag is a result of the differential regression capability of local temperature fluctuations when responding to the large-scale fluctuation. An average speed of propagations as large as greater than or similar to 15% of the speed of light may be required by this common fluctuation. Several potential physical mechanisms for such propagations are discussed. Our interesting phenomenological scenario may shed new light on comprehending the UV/optical continuum variations of active galactic nuclei.
Keywordaccretion, accretion disks galaxies: active galaxies: individual (NGC 5548) galaxies: nuclei
DOI10.3847/1538-4357/aab091
WOS KeywordBROAD-LINE REGION ; SHORT-TIMESCALE VARIABILITY ; AGN MONITORING PROJECT ; X-RAY-EMISSION ; BLACK-HOLES ; OPTICAL VARIABILITY ; NGC 7469 ; MULTIWAVELENGTH OBSERVATIONS ; ULTRAVIOLET-SPECTRUM ; DOMINATED ACCRETION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000427492200004
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22377
Collection中国科学院紫金山天文台
Corresponding AuthorCai, Zhen-Yi
Affiliation1.Univ Sci & Technol China, Dept Astron, 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.Penn State Univ, Dept Astron & Astrophys, 525 Davey Lab, University Pk, PA 16802 USA
4.Xiamen Univ, Dept Astron, Xiamen 361005, Fujian, Peoples R China
5.Xiamen Univ, SHAO XMU Joint Ctr Astrophys, Xiamen 361005, Fujian, Peoples R China
6.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
7.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Cai, Zhen-Yi,Wang, Jun-Xian,Zhu, Fei-Fan,et al. EUCLIA-Exploring the UV/Optical Continuum Lag in Active Galactic Nuclei. I. A Model without Light Echoing[J]. ASTROPHYSICAL JOURNAL,2018,855(2):17.
APA Cai, Zhen-Yi.,Wang, Jun-Xian.,Zhu, Fei-Fan.,Sun, Mou-Yuan.,Gu, Wei-Min.,...&Yuan, Feng.(2018).EUCLIA-Exploring the UV/Optical Continuum Lag in Active Galactic Nuclei. I. A Model without Light Echoing.ASTROPHYSICAL JOURNAL,855(2),17.
MLA Cai, Zhen-Yi,et al."EUCLIA-Exploring the UV/Optical Continuum Lag in Active Galactic Nuclei. I. A Model without Light Echoing".ASTROPHYSICAL JOURNAL 855.2(2018):17.
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