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The Influence of the Secular Perturbation of an Intermediate-mass Companion. I. Eccentricity Excitation of Disk Stars at the Galactic Center
Zheng, Xiaochen1; Lin, Douglas N. C.2,3; Mao, Shude1,4
2020-12-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume905Issue:2Pages:16
AbstractThere is a dense group of OB and Wolf-Rayet stars within a fraction of a parsec from the supermassive black hole (SMBH) at the Galactic Center. These stars appear to be coeval and relatively massive. A subgroup of these stars orbits on the same plane. If they emerged with low- to modest-eccentricity orbits from a common gaseous disk around the central SMBH, their inferred life span would not be sufficiently long to account for the excitation of their high orbital eccentricity through dynamical relaxation. Here we analyze the secular perturbation of Galactic Center stars by an intermediate-mass companion (IMC) as a potential mechanism to account for these young disk stars' high eccentricity. This IMC may be either an intermediate-mass black hole or a compact cluster such as IRS 13E. If its orbital angular momentum vector is antiparallel to that of the disk stars, this perturbation would be effective in exciting the eccentricity of stars with orbital precession rates that resonate with the IMC's precession rate. If it orbits around the SMBH in the same direction as the disk stars, the eccentricity of the young stars can still be highly excited by the IMC during the depletion of their natal disk, possibly associated with the launch of the Fermi bubble. In this scenario, the IMC's precession rate decreases, and its secular resonance sweeps through the proximity of the young stars. We carry out numerical simulations with various inclination angles between the orbits of the IMC and the disk stars and show that this secular interaction is a robust mechanism to excite the eccentricity and inclination of some disk stars.
KeywordCelestial mechanics Galaxy stellar content Stellar dynamics Early-type stars Stellar kinematics Computational methods Galactic center Galaxy circumnuclear disk
Funding OrganizationNational Key Research and Development Program of China ; National Key Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation
DOI10.3847/1538-4357/abc8e5
WOS KeywordSUPERMASSIVE BLACK-HOLE ; SAGITTARIUS-A-ASTERISK ; DYNAMICAL FRICTION ; YOUNG STARS ; MILKY-WAY ; HYPERVELOCITY STARS ; PLANETARY SYSTEMS ; NUCLEAR CLUSTER ; PROPER-MOTION ; ORBITS
Language英语
Funding ProjectNational Key Research and Development Program of China[2018YFA0404501] ; National Science Foundation of China[11821303] ; National Science Foundation of China[11761131004] ; National Science Foundation of China[11761141012] ; China Postdoctoral Science Foundation[2017M610865]
Funding OrganizationNational Key Research and Development Program of China ; National Key Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000603162000001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/80470
Collection中国科学院国家天文台
Corresponding AuthorZheng, Xiaochen
Affiliation1.Tsinghua Univ, Dept Astron, Beijing, Peoples R China
2.Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA
3.Tsinghua Univ, Inst Adv Studies, Beijing, Peoples R China
4.Chinese Acad Sci, Natl Astron Observ China, 20A Datun Rd, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Zheng, Xiaochen,Lin, Douglas N. C.,Mao, Shude. The Influence of the Secular Perturbation of an Intermediate-mass Companion. I. Eccentricity Excitation of Disk Stars at the Galactic Center[J]. ASTROPHYSICAL JOURNAL,2020,905(2):16.
APA Zheng, Xiaochen,Lin, Douglas N. C.,&Mao, Shude.(2020).The Influence of the Secular Perturbation of an Intermediate-mass Companion. I. Eccentricity Excitation of Disk Stars at the Galactic Center.ASTROPHYSICAL JOURNAL,905(2),16.
MLA Zheng, Xiaochen,et al."The Influence of the Secular Perturbation of an Intermediate-mass Companion. I. Eccentricity Excitation of Disk Stars at the Galactic Center".ASTROPHYSICAL JOURNAL 905.2(2020):16.
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