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Accretion-modified Stars in Accretion Disks of Active Galactic Nuclei: Slowly Transient Appearance
Wang, Jian-Min1,2,3; Liu, Jun-Rong1,2; Ho, Luis C.4,5; Du, Pu1
2021-04-01
Source PublicationASTROPHYSICAL JOURNAL LETTERS
ISSN2041-8205
Volume911Issue:1Pages:8
AbstractCompact objects are expected to exist in the accretion disks of supermassive black holes (SMBHs) in active galactic nuclei (AGNs), and in the presence of such a dense environment (similar to 10(14) cm(-3)), they will form a new kind of stellar population denoted as accretion-modified stars (AMSs). This hypothesis is supported by recent LIGO/Virgo detection of the mergers of very high-mass stellar binary black holes (BHs). We show that the AMSs will be trapped by the SMBH disk within a typical AGN lifetime. In the context of SMBH disks, the rates of Bondi accretion onto BHs are similar to 10(9) L (Edd)/c (2), where L (Edd) is the Eddington luminosity and c is the speed of light. Outflows developed from the hyper-Eddington accretion strongly impact the Bondi sphere and induce episodic accretion. We show that the hyper-Eddington accretion will be halted after an accretion interval of t (a) similar to 10(5) m (1) s, where m (1) = m (center dot)/10M (circle dot) is the BH mass. The kinetic energy of the outflows accumulated during t (a) is equivalent to 10 supernovae driving an explosion of the Bondi sphere and developing blast waves. We demonstrate that a synchrotron flare from relativistic electrons accelerated by the blast waves peaks in the soft X-ray band (similar to 0.1 keV), significantly contributing to the radio, optical, UV, and soft X-ray emission of typical radio-quiet quasars. External inverse Compton scattering of the electrons peaks around 40 GeV and is detectable through Fermi-LAT. The flare, decaying with t (-6/5) with a few months, will appear as a slowly varying transient. The flares, occurring at a rate of a few per year in radio-quiet quasars, provide a new mechanism for explaining AGN variability.
Funding OrganizationNational Key R&D Program of China ; National Key R&D Program of China ; NSFC ; NSFC ; National Key R&D Program of China ; National Key R&D Program of China ; NSFC ; NSFC ; National Key R&D Program of China ; National Key R&D Program of China ; NSFC ; NSFC ; National Key R&D Program of China ; National Key R&D Program of China ; NSFC ; NSFC
DOI10.3847/2041-8213/abee81
Language英语
Funding ProjectNational Key R&D Program of China[2016YFA0400701] ; National Key R&D Program of China[2020YFC2201400] ; National Key R&D Program of China[2016YFA0400702] ; NSFC[NSFC-11991050] ; NSFC[NSFC-11991054] ; NSFC[NSFC-11833008] ; NSFC[NSFC-11690024] ; NSFC[11721303] ; NSFC[11991052] ; NSFC[NSFC-12022301] ; NSFC[NSFC-11991051] ; NSFC[NSFC-11873048] ; [QYZDJ-SSW-SLH007] ; [XDB23010400]
Funding OrganizationNational Key R&D Program of China ; National Key R&D Program of China ; NSFC ; NSFC ; National Key R&D Program of China ; National Key R&D Program of China ; NSFC ; NSFC ; National Key R&D Program of China ; National Key R&D Program of China ; NSFC ; NSFC ; National Key R&D Program of China ; National Key R&D Program of China ; NSFC ; NSFC
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000641565400001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/78167
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.Natl Astron Observ China, 20A Datun Rd, Beijing 100020, Peoples R China
4.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
5.Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China
Recommended Citation
GB/T 7714
Wang, Jian-Min,Liu, Jun-Rong,Ho, Luis C.,et al. Accretion-modified Stars in Accretion Disks of Active Galactic Nuclei: Slowly Transient Appearance[J]. ASTROPHYSICAL JOURNAL LETTERS,2021,911(1):8.
APA Wang, Jian-Min,Liu, Jun-Rong,Ho, Luis C.,&Du, Pu.(2021).Accretion-modified Stars in Accretion Disks of Active Galactic Nuclei: Slowly Transient Appearance.ASTROPHYSICAL JOURNAL LETTERS,911(1),8.
MLA Wang, Jian-Min,et al."Accretion-modified Stars in Accretion Disks of Active Galactic Nuclei: Slowly Transient Appearance".ASTROPHYSICAL JOURNAL LETTERS 911.1(2021):8.
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