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EPISODIC ACTIVITIES OF SUPERMASSIVE BLACK HOLES AT REDSHIFT z <= 2: DRIVEN BY MERGERS?
Li YR(李彦荣); Wang JM(王建民); Hu C(胡晨); Zhang S(张澍); Li, YR; Wang, JM; Yuan, YF; Hu, C; Zhang, S
2010
发表期刊ASTROPHYSICAL JOURNAL
卷号710期号:1页码:878-885
通讯作者[Li, Yan-Rong ; Wang, Jian-Min ; Hu, Chen ; Zhang, Shu] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China ; [Yuan, Ye-Fei] Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Peoples R China ; [Li, Yan-Rong] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China ; [Wang, Jian-Min] Chinese Acad Sci, Theoret Phys Ctr Sci Facil, Beijing 100864, Peoples R China
文章类型Article
摘要It has been suggested for quite a long time that galaxy mergers trigger activities of supermassive black holes (SMBHs) on the grounds of imaging observations of individual galaxies. To quantitatively examine this hypothesis, we calculate quasar luminosity functions (LFs) by manipulating the observed galaxy LFs (z less than or similar to 2) and theoretical merger rates from semi-analytical formulations. We find that the model reproduces the observed quasar LFs provided that the mass ratio (q) of the secondary galaxy to the newly formed one changes with cosmic time. The results show that the fraction of major mergers decreases from f(maj) similar to 0.2 at z similar to 2 to f(maj) -> 0 at z similar to 0. As a consequence, the newly formed SMBHs from major mergers at z similar to 2 may acquire a maximal spin due to the orbital angular momentum of the merging holes. Subsequently, random accretion led by minor mergers rapidly drives the SMBHs to spin down. Such an evolutionary trend of the SMBH spins is consistent with the fact that radiative efficiency of accreting SMBHs strongly declines with cosmic time, reported by Wang et al. This suggests that minor mergers are important in triggering activities of SMBHs at low redshift, while major mergers may dominate at high redshift.
关键词galaxies: evolution galaxies: high-redshift quasars: general
学科领域Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics ; Astronomy & Astrophysics
DOI10.1088/0004-637X/710/1/878
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语种英语
研究领域[WOS]Astronomy & Astrophysics ; Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000273850800070
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文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/238665
专题粒子天体物理中心
实验物理中心
作者单位中国科学院高能物理研究所
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Li YR,Wang JM,Hu C,et al. EPISODIC ACTIVITIES OF SUPERMASSIVE BLACK HOLES AT REDSHIFT z <= 2: DRIVEN BY MERGERS?[J]. ASTROPHYSICAL JOURNAL,2010,710(1):878-885.
APA 李彦荣.,王建民.,胡晨.,张澍.,Li, YR.,...&Zhang, S.(2010).EPISODIC ACTIVITIES OF SUPERMASSIVE BLACK HOLES AT REDSHIFT z <= 2: DRIVEN BY MERGERS?.ASTROPHYSICAL JOURNAL,710(1),878-885.
MLA 李彦荣,et al."EPISODIC ACTIVITIES OF SUPERMASSIVE BLACK HOLES AT REDSHIFT z <= 2: DRIVEN BY MERGERS?".ASTROPHYSICAL JOURNAL 710.1(2010):878-885.
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