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Observational signatures of close binaries of supermassive black holes in active galactic nuclei
Wang, Jian-Min1,2,3; Li, Yan-Rong1
2020-10-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume20Issue:10Pages:16
AbstractInspired by the General Relativity for many decades, experimental physicists and astronomers have a solid dream to detect gravitational waves (GWs) from mergers of black holes, which came true until the excellent performance of the Laser Interferometer Gravitational-Wave Observatory (LIGO) at hundreds Hz. Nano-Hz GWs are expected to be radiated by close-binaries of supermassive black holes (CB-SMBHs; defined as those with separations less than similar to 0.1 pc) formed during galaxy mergers and detected through the Pulsar Timing Array (PTA) technique. As of the writing, there remains no nano-Hz GWs detection. Searching for CB-SMBHs is also observationally elusive though there exist a number of possible candidates. In this review, we focus on observational signatures of CB-SMBHs from theoretic expectations, simulations and observations. These signatures appear in energy distributions of multiwavelength continuum, long term variations of continuum, jet morphology, reverberation delay maps and spectroastrometry of broad emission lines, AGN type transitions between type-1 and type-2 (changing-look), and gaseous dynamics of circumbinary disks, etc. Unlike hundred-Hz GWs from stellar mass black hole binaries, the waveform chirping of nano-Hz GWs is too slow to detect in a reasonable human timescale. We have to resort to electromagnetic observations to measure orbital parameters of CB-SMBHs to test nano-Hz GW properties. Reverberation mapping is a powerful tool for probing kinematics and geometry of ionized gas in the gravitational well of SMBHs (single or binary) and therefore provides a potential way to determine orbital parameters of CB-SMBHs. In particular, a combination of reverberation mapping with spectroastrometry (realized at the Very Large Telescope Interferometer) will further reinforce this capability. The Atacama Large Millimeter/submillimeter Array (ALMA) and the forthcoming Square Kilometre Array (SKA) are suggested to reveal dynamics of circumbinary disks through molecular emission lines.
Keywordgalaxies active quasars supermassive black holes gravitational waves
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (CAS) ; Key Research Program of Frontier Sciences of the 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 R&D Program of China ; National Key R&D Program of China ; Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (CAS) ; Key Research Program of Frontier Sciences of the 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 R&D Program of China ; National Key R&D Program of China ; Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (CAS) ; Key Research Program of Frontier Sciences of the 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 R&D Program of China ; National Key R&D Program of China ; Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (CAS) ; Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (CAS) ; CAS Key Research Program ; CAS Key Research Program
DOI10.1088/1674-4527/20/10/160
WOS KeywordCONTINUOUS GRAVITATIONAL-WAVES ; TIMING ARRAY LIMITS ; SYSTEMATIC SEARCH ; VARIABLE QUASARS ; ACCRETION ; MERGERS ; GAS ; RETROGRADE ; GALAXIES ; DISK
Language英语
Funding ProjectNational Natural Science Foundation of China[11833008] ; National Natural Science Foundation of China[11991054] ; National Key R&D Program of China[2016YFA0400701] ; Key Research Program of Frontier Sciences of the 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 R&D Program of China ; National Key R&D Program of China ; Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (CAS) ; Key Research Program of Frontier Sciences of the 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 R&D Program of China ; National Key R&D Program of China ; Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (CAS) ; Key Research Program of Frontier Sciences of the 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 R&D Program of China ; National Key R&D Program of China ; Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (CAS) ; Key Research Program of Frontier Sciences of the 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 R&D Program of China ; National Key R&D Program of China ; Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (CAS) ; Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (CAS) ; CAS Key Research Program ; CAS Key Research Program
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000590252900001
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/81117
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, Beijing 100049, Peoples R China
2.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Natl Astron Observatories, Beijing 100101, Peoples R China
Recommended Citation
GB/T 7714
Wang, Jian-Min,Li, Yan-Rong. Observational signatures of close binaries of supermassive black holes in active galactic nuclei[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2020,20(10):16.
APA Wang, Jian-Min,&Li, Yan-Rong.(2020).Observational signatures of close binaries of supermassive black holes in active galactic nuclei.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,20(10),16.
MLA Wang, Jian-Min,et al."Observational signatures of close binaries of supermassive black holes in active galactic nuclei".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 20.10(2020):16.
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