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Dynamical evidence from the sub-parsec counter-rotating disc for a close binary of supermassive black holes in NGC1068
Wang, Jian-Min1,2,3; Songsheng, Yu-Yang1,2; Li, Yan-Rong1; Du, Pu1; Yu, Zhe1,2
2020-09-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume497Issue:1Pages:1020-1028
AbstractA puzzle in NGC1068 is how to secularly maintain the counter-rotating disc (CRD) from 0.2 to 7 pc unambiguously detected by recent ALMA observations of molecular gas. Upon further dynamical analysis, we find that the Kelvin-Helmholtz (KH) instability (KHI) results in an unavoidable catastrophe for the disc developed at the interface between the reversely rotating parts. We demonstrate that a close binary of supermassive black holes (CB-SMBHs) provides tidal torques to prevent the disc from the KH catastrophe and are led to the conclusion that there is a CB-SMBH at the centre of NGC1068. The binary is composed of black holes with a separation of 0.1 pc from GRAVITY/VLTI observations, a total mass of 1.3 x 10(7) M-circle dot and a mass ratio of similar to 0.3 estimated from the angular momentum (AM) budget of the global system. The KHI gives rise to a gap without cold gas at the velocity interface that overlaps with the observed gap of hot and cold dust regions. Releases of kinetic energies from the KHI of the disc are in agreement with observed emissions in radio and lambda-rays. Such a binary is shrinking on a time-scale much longer than the local Hubble time via gravitational waves, however, the KHI leads to an efficient annihilation of the orbital AM and a speed-up merge of the binary, providing a new mechanism for solving the long-standing issue of 'final parsec problem'. Future observations of GRAVITY+/VLTI are expected to be able to spatially resolve the CB-SMBHs suggested in this paper.
Keywordaccretion, accretion discs galaxies: active
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS) ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS) ; CAS Key Research Program ; CAS Key Research Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS) ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS) ; CAS Key Research Program ; CAS Key Research Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS) ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS) ; CAS Key Research Program ; CAS Key Research Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS) ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS) ; CAS Key Research Program ; CAS Key Research Program
DOI10.1093/mnras/staa1985
WOS KeywordACTIVE GALACTIC NUCLEI ; WATER MASER EMISSION ; NGC 1068 ; ACCRETION DISKS ; OBSCURING TORUS ; EVOLUTION ; GAS ; GALAXIES ; MERGERS ; REVERBERATION
Language英语
Funding ProjectNational Natural Science Foundation of China[11833008] ; National Natural Science Foundation of China[11991054] ; National Key Research and Development Program of China[2016YFA0400701] ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS)[QYZDJ-SSW-SLH007] ; CAS Key Research Program[KJZD-EW-M06]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS) ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS) ; CAS Key Research Program ; CAS Key Research Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS) ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS) ; CAS Key Research Program ; CAS Key Research Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS) ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS) ; CAS Key Research Program ; CAS Key Research Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS) ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS) ; CAS Key Research Program ; CAS Key Research Program
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000574919600076
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/81788
Collection中国科学院国家天文台
Corresponding AuthorWang, Jian-Min
Affiliation1.Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, 19B Yuquan Rd, Beijing 100049, Peoples R China
2.Univ Chinese Acad Sci, Sch Astron & Space Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Natl Astron Observ China, 20A Datun Rd, Beijing 100020, Peoples R China
Recommended Citation
GB/T 7714
Wang, Jian-Min,Songsheng, Yu-Yang,Li, Yan-Rong,et al. Dynamical evidence from the sub-parsec counter-rotating disc for a close binary of supermassive black holes in NGC1068[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2020,497(1):1020-1028.
APA Wang, Jian-Min,Songsheng, Yu-Yang,Li, Yan-Rong,Du, Pu,&Yu, Zhe.(2020).Dynamical evidence from the sub-parsec counter-rotating disc for a close binary of supermassive black holes in NGC1068.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,497(1),1020-1028.
MLA Wang, Jian-Min,et al."Dynamical evidence from the sub-parsec counter-rotating disc for a close binary of supermassive black holes in NGC1068".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 497.1(2020):1020-1028.
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