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Correlation between excitation index and Eddington ratio in radio galaxies
Hu, Jing-Fu1,4; Cao, Xin-Wu2,3; Chen, Liang1; You, Bei5
2016-09-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume16Issue:9
AbstractWe use a sample of 111 radio galaxies with redshift z < 0.3 to investigate their nuclear properties. The black hole masses of the sources in this sample are estimated with the velocity dispersion/luminosity of the galaxies, or the width of the broad-lines. We find that the excitation index, the relative intensity of low and high excitation lines, is correlated with the Eddington ratio for this sample. The size of the narrow-line region (NLR) was found to vary with ionizing luminosity as R-NLR proportional to L-ion(0.25) (Liu et al. 2013). Using this empirical relation, we find that the correlation between the excitation index and the Eddington ratio can be reproduced by photoionization models. We adopt two sets of spectral energy distributions (SEDs), with or without a big blue bump in ultraviolet as the ionizing continuum, and infer that the modeled correlation between the excitation index and the Eddington ratio is insensitive to the applied SED. This means that the difference between high excitation galaxies and low excitation galaxies is not caused by the different accretion modes in these sources. Instead, it may be caused by the size of the NLR.
KeywordAccretion, Accretion Disks Black Hole Physics Galaxies: Active
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/1674-4527/16/9/136
WOS KeywordACTIVE GALACTIC NUCLEI ; NARROW-LINE REGION ; BLACK-HOLE MASSES ; QUASARS ; LUMINOSITY ; DICHOTOMY ; SPECTRA ; SAMPLE ; SIZE ; JET
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000385995800004
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23600
Collection中国科学院紫金山天文台
Corresponding AuthorHu, Jing-Fu
Affiliation1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
2.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
3.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Bartycka 18, PL-00716 Warsaw, Poland
Recommended Citation
GB/T 7714
Hu, Jing-Fu,Cao, Xin-Wu,Chen, Liang,et al. Correlation between excitation index and Eddington ratio in radio galaxies[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2016,16(9).
APA Hu, Jing-Fu,Cao, Xin-Wu,Chen, Liang,&You, Bei.(2016).Correlation between excitation index and Eddington ratio in radio galaxies.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,16(9).
MLA Hu, Jing-Fu,et al."Correlation between excitation index and Eddington ratio in radio galaxies".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 16.9(2016).
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