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Correlation between the line width and the line flux of the double-peaked broad H alpha of 3C390.3
Zhang, Xue-Guang1,2
2013-03-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume429Issue:3Pages:2274-2286
Corresponding AuthorZhang, XG (reprint author), Chinese Acad Sci, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China. Email: xgzhang@pmo.ac.cn
AbstractIn this paper, we carefully check the correlation between the line width (second moment) and the line flux of the double-peaked broad H alpha of the well-known mapped active galactic nucleus (AGN) 3C390.3 in order to show some further distinctions between double-peaked emitters and normal broad-line AGN. Based on the virialization assumption M-BH proportional to R-BLR x V-2(BLR) and the empirical relation R-BLR proportional to L-similar to 0.5, one strong negative correlation between the line width and the line flux of the double-peaked broad lines should be expected for 3C390.3, such as the negative correlation confirmed for the mapped broad-line object NGC5548, R-BLR x V-2(BLR) proportional to L-similar to 0.5 x sigma(2) = constant. Moreover, based on the public spectra around 1995 from the AGN WATCH project for 3C390.3, one reliable positive correlation is found between the line width and the line flux of the double-peaked broad H alpha. In the context of the proposed theoretical accretion disc model for double-peaked emitters, the unexpected positive correlation can be naturally explained, due to different time delays for the inner and outer parts of the disc-like broad-line region (BLR) of 3C390.3. Moreover, the virialization assumption is checked and found to be still available for 3C390.3. However, the time-varying size of the BLR of 3C390.3 cannot be expected by the empirical relation R-BLR proportional to L-similar to 0.5. In other words, the mean size of the BLR of 3C390.3 can be estimated by the continuum luminosity (line luminosity), while the continuum emission strengthening leads to the size of BLR decreasing (not increasing) in different moments for 3C390.3. Then, we compared our results of 3C390.3 with the previous results reported in the literature for the other double-peaked emitters, and found that before to clearly correct the effects from disc physical parameters varying (such as the effects of disc precession) for long-term observed line spectra, it is not so meaningful to discuss the correlation of the line parameters of double-peaked broad lines. Furthermore, due to the probable 'external' ionizing source with so far unclear structures, it is hard to give one conclusion that the positive correlation between the line width and the line flux can be found for all double-peaked emitters, even after the considerations of disc physical parameters varying. However, once one positive correlation of broad-line parameters is found, the accretion disc origination of the broad line should be considered first.
KeywordGalaxies: Active Galaxies: Individual: 3c390.3 Galaxies: Nuclei Quasars: Emission Lines Galaxies: Seyfert
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1093/mnras/sts496
WOS KeywordACTIVE GALACTIC NUCLEI ; BLACK-HOLE MASS ; IONIZATION EMISSION-LINES ; TERM PROFILE VARIABILITY ; WARPED ACCRETION DISCS ; CROSS-CORRELATION LAGS ; GALAXY 3C 390.3 ; LONG-TERM ; BALMER LINES ; OPTICAL WAVELENGTHS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000318271300030
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/9910
Collection南极天文中心
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Ctr Antarctic Astron, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Xue-Guang. Correlation between the line width and the line flux of the double-peaked broad H alpha of 3C390.3[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2013,429(3):2274-2286.
APA Zhang, Xue-Guang.(2013).Correlation between the line width and the line flux of the double-peaked broad H alpha of 3C390.3.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,429(3),2274-2286.
MLA Zhang, Xue-Guang."Correlation between the line width and the line flux of the double-peaked broad H alpha of 3C390.3".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 429.3(2013):2274-2286.
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