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THE LOW FREQUENCY OF DUAL ACTIVE GALACTIC NUCLEI VERSUS THE HIGH MERGER RATE OF GALAXIES: A PHENOMENOLOGICAL MODEL
Yu, Qingjuan1; Lu, Youjun2; Mohayaee, Roya3; Colin, Jacques3
2011-09-01
Source PublicationASTROPHYSICAL JOURNAL
Volume738Issue:1
AbstractDual active galactic nuclei (AGNs) are natural byproducts of hierarchical mergers of galaxies in the Lambda CDM cosmogony. Recent observations have shown that only a small fraction (similar to 0.1%-2.5%) of AGNs at redshift z less than or similar to 0.3 are dual with kpc-scale separations, which is rather low compared to the high merger rate of galaxies. Here we construct a phenomenological model to estimate the number density of dual AGNs and its evolution according to the observationally estimated major merger rates of galaxies and various scaling relations on the properties of galaxies and their central massive black holes. We show that our model reproduces the observed frequency and separation distribution of dual AGNs provided that significant nuclear activities are triggered only in gas-rich progenitor galaxies with central massive black holes and only when the nuclei of these galaxies are roughly within the half-light radii of their companion galaxies. Under these constraints, the observed low dual AGN frequency is consistent with the relatively high merger rate of galaxies and supports the hypothesis that major mergers lead to AGN/QSO activities. We also predict that the number of kpc-scale dual AGNs decreases with increasing redshift and only about 0.02%-0.06% of AGNs are dual AGNs with double-peaked narrow line features at redshifts of z similar to 0.5-1.2. Future observations of high-redshift dual AGNs would provide a solid test for this prediction.
KeywordBlack Hole Physics Galaxies: Active Galaxies: Interactions Galaxies: Nuclei Galaxies: Seyfert Quasars: General
DOI10.1088/0004-637X/738/1/92
Indexed BySCI
Language英语
WOS IDWOS:000294015500092
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8020
Collection星系宇宙学研究部
Affiliation1.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
2.Natl Astron Observ China, Beijing 100012, Peoples R China
3.UPMC, CNRS, Inst Astrophys Paris, F-75014 Paris, France
Recommended Citation
GB/T 7714
Yu, Qingjuan,Lu, Youjun,Mohayaee, Roya,et al. THE LOW FREQUENCY OF DUAL ACTIVE GALACTIC NUCLEI VERSUS THE HIGH MERGER RATE OF GALAXIES: A PHENOMENOLOGICAL MODEL[J]. ASTROPHYSICAL JOURNAL,2011,738(1).
APA Yu, Qingjuan,Lu, Youjun,Mohayaee, Roya,&Colin, Jacques.(2011).THE LOW FREQUENCY OF DUAL ACTIVE GALACTIC NUCLEI VERSUS THE HIGH MERGER RATE OF GALAXIES: A PHENOMENOLOGICAL MODEL.ASTROPHYSICAL JOURNAL,738(1).
MLA Yu, Qingjuan,et al."THE LOW FREQUENCY OF DUAL ACTIVE GALACTIC NUCLEI VERSUS THE HIGH MERGER RATE OF GALAXIES: A PHENOMENOLOGICAL MODEL".ASTROPHYSICAL JOURNAL 738.1(2011).
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