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State-of-the-art AGN SEDs for photoionization models: BLR predictions confront the observations
Ferland, G. J.1; Done, C.2; Jin, C.3,4; Landt, H.2; Ward, M. J.2
2020-06-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume494Issue:4Pages:5917-5922
AbstractThe great power offered by photoionization models of active galactic nuclei emission line regions has long been mitigated by the fact that very little is known about the spectral energy distribution (SED) between the Lyman limit, where intervening absorption becomes a problem, and 0.3 keV, where soft X-ray observations become possible. The emission lines themselves can, to some degree, be used to probe the SED, but only in the broadest terms. This paper employs a new generation of theoretical SEDs that are internally self-consistent, energy conserving, and tested against observations, to infer properties of the emission-line regions. The SEDs are given as a function of the Eddington ratio, allowing emission-line correlations to be investigated on a fundamental basis. We apply the simplest possible tests, based on the foundations of photoionization theory, to investigate the implications for the geometry of the emission-line region. The SEDs become more far-ultraviolet bright as the Eddington ratio increases, so the equivalent widths of recombination lines should also become larger, an effect that we quantify. The observed lack of correlation between Eddington ratio and equivalent width shows that the cloud covering factor must decrease as Eddington ratio increases. This would be consistent with recent models proposing that the broad-line region is a failed dusty wind off the accretion disc.
Keywordaccretion, accretion discs line: formation radiation mechanisms: general galaxies: active galaxies: nuclei galaxies: Seyfert
Funding OrganizationNSF ; NSF ; NASA ; NASA ; STScI ; STScI ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Science and Technology Facilities Council ; Science and Technology Facilities Council ; NSF ; NSF ; NASA ; NASA ; STScI ; STScI ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Science and Technology Facilities Council ; Science and Technology Facilities Council ; NSF ; NSF ; NASA ; NASA ; STScI ; STScI ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Science and Technology Facilities Council ; Science and Technology Facilities Council ; NSF ; NSF ; NASA ; NASA ; STScI ; STScI ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Science and Technology Facilities Council ; Science and Technology Facilities Council
DOI10.1093/mnras/staa1207
WOS KeywordACTIVE GALACTIC NUCLEI ; BROAD-LINE REGION ; X-RAY ; EMISSION ; CONTINUUM ; RELEASE ; ORIGIN ; CLOUDS ; ATLAS ; DISC
Language英语
Funding ProjectNSF[1816537] ; NASA[ATP 17ATP17-0141] ; STScI[HST-AR-15018] ; National Natural Science Foundation of China[11873054] ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences[XDA15052100] ; Science and Technology Facilities Council[ST/P000541/1]
Funding OrganizationNSF ; NSF ; NASA ; NASA ; STScI ; STScI ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Science and Technology Facilities Council ; Science and Technology Facilities Council ; NSF ; NSF ; NASA ; NASA ; STScI ; STScI ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Science and Technology Facilities Council ; Science and Technology Facilities Council ; NSF ; NSF ; NASA ; NASA ; STScI ; STScI ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Science and Technology Facilities Council ; Science and Technology Facilities Council ; NSF ; NSF ; NASA ; NASA ; STScI ; STScI ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Science and Technology Facilities Council ; Science and Technology Facilities Council
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000539097800099
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/83297
Collection中国科学院国家天文台
Corresponding AuthorFerland, G. J.
Affiliation1.Univ Kentucky, Dept Phys, Lexington, KY 40506 USA
2.Univ Durham, Dept Phys, South Rd, Durham DH1 3LE, England
3.Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 100101, Peoples R China
4.Univ Chinese Acad Sci, Sch Astron & Space Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
Recommended Citation
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Ferland, G. J.,Done, C.,Jin, C.,et al. State-of-the-art AGN SEDs for photoionization models: BLR predictions confront the observations[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2020,494(4):5917-5922.
APA Ferland, G. J.,Done, C.,Jin, C.,Landt, H.,&Ward, M. J..(2020).State-of-the-art AGN SEDs for photoionization models: BLR predictions confront the observations.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,494(4),5917-5922.
MLA Ferland, G. J.,et al."State-of-the-art AGN SEDs for photoionization models: BLR predictions confront the observations".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 494.4(2020):5917-5922.
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