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Hydrodynamical simulations of the triggering of nuclear activities by minor mergers of galaxies
Chao Yang1; JunQiang Ge1; YouJun Lu1
2019
Source Publication天文和天体物理学研究:英文版
ISSN1674-4527
Volume19.0Issue:012Pages:245
AbstractMajor mergers of galaxies are considered to be an efficient way to trigger Active Galactic Nuclei and are thought to be responsible for the phenomenon of quasars. This has however recently been challenged by observations of a large number of low luminosity Active Galactic Nuclei at low redshift(z■1) without obvious major merger signatures. Minor mergers are frequently proposed to explain the existence of these Active Galactic Nuclei. In this paper, we perform nine high resolution hydrodynamical simulations of minor galaxy mergers, and investigate whether nuclear activities can be efficiently triggered by minor mergers, by setting various properties for the progenitor galaxies of those mergers. We find that minor galaxy mergers can activate the massive black hole in the primary galaxy with an Eddington ratio of f Edd > 0.01 and> 0.05(or a bolometric luminosity > 10^43 and > 10^44 erg s^-1) with a duration of 2.71 and 0.49 Gyr(or 2.69 and 0.19 Gyr), respectively. The nuclear activity of the primary galaxy strongly depends on the nucleus separation, such that the nucleus is more active as the two nuclei approach each other. Dual Active Galactic Nuclei systems can still possibly be formed by minor mergers of galaxies, though the time duration for dual Active Galactic Nuclei is only ~ 0.011 Gyr and ~ 0.017 Gyr with Eddington ratio of f Edd > 0.05 and bolometric luminosity > 10^44 erg s^-1. This time period is typically shorter than that of dual Active Galactic Nuclei induced by major galaxy mergers.
Keywordgalaxies:binary quasars:general methods:n-body simulations
Language英语
Funding Project[National Key Program for Science and Technology Research and Development] ; [National Natural Science Foundation of China] ; [Strategic Priority Program of the Chinese Academy of Sciences]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/65221
Collection中国科学院国家天文台
Affiliation1.中国科学院南京天文光学技术研究所
2.中国科学院
3.CAS Key Laboratory for Computational Astrophysics,National Astronomical Observatories,Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Chao Yang,JunQiang Ge,YouJun Lu. Hydrodynamical simulations of the triggering of nuclear activities by minor mergers of galaxies[J]. 天文和天体物理学研究:英文版,2019,19.0(012):245.
APA Chao Yang,JunQiang Ge,&YouJun Lu.(2019).Hydrodynamical simulations of the triggering of nuclear activities by minor mergers of galaxies.天文和天体物理学研究:英文版,19.0(012),245.
MLA Chao Yang,et al."Hydrodynamical simulations of the triggering of nuclear activities by minor mergers of galaxies".天文和天体物理学研究:英文版 19.0.012(2019):245.
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