NAOC Open IR
Orbital Distribution of Infalling Satellite Halos across Cosmic Time
Li, Zhao-Zhou1,2,3; Zhao, Dong-Hai2; Jing, Y. P.1,3,4; Han, Jiaxin1,3; Dong, Fu-Yu2,5
2020-12-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume905Issue:2Pages:11
AbstractThe initial orbits of infalling subhalos largely determine the subsequent evolution of the subhalos and satellite galaxies therein and shed light on the assembly of their hosts. Using a large set of cosmological simulations of various resolutions, we quantify the orbital distribution of subhalos at infall time and its mass and redshift dependence in a large dynamic range. We further provide a unified and accurate model validated across cosmic time, which can serve as the initial condition for semianalytic models. We find that the infall velocity v follows a nearly universal distribution peaked near the host virial velocity V-h for any subhalo mass or redshift, while the infall orbit is most radially biased when v similar to V-h. Moreover, subhalos that have a higher host mass or a higher sub-to-host ratio tend to move along a more radial direction with a relatively smaller angular momentum than their low host mass or low sub-to-host ratio counterparts, though they share the same normalized orbital energy. These relations are nearly independent of the redshift when using the density peak height as the proxy for host halo mass. The above trends are consistent with the scenario where the dynamical environment is relatively colder for more massive structures because their own gravity is more likely to dominate the local potentials. Based on this understanding, the more massive or isolated halos are expected to have higher velocity anisotropy.
KeywordDark matter Galaxy dark matter halos Galaxy kinematics Galaxy dynamics Large-scale structure of the universe N-body simulations Astrostatistics Galaxy formation
Funding OrganizationNSFC ; NSFC ; Knowledge Innovation Program of CAS ; Knowledge Innovation Program of CAS ; Shanghai talent development funding ; Shanghai talent development funding ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; 111 project ; 111 project ; Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education ; Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education ; NSFC ; NSFC ; Knowledge Innovation Program of CAS ; Knowledge Innovation Program of CAS ; Shanghai talent development funding ; Shanghai talent development funding ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; 111 project ; 111 project ; Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education ; Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education ; NSFC ; NSFC ; Knowledge Innovation Program of CAS ; Knowledge Innovation Program of CAS ; Shanghai talent development funding ; Shanghai talent development funding ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; 111 project ; 111 project ; Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education ; Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education ; NSFC ; NSFC ; Knowledge Innovation Program of CAS ; Knowledge Innovation Program of CAS ; Shanghai talent development funding ; Shanghai talent development funding ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; 111 project ; 111 project ; Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education ; Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education
DOI10.3847/1538-4357/abc481
WOS KeywordDARK-MATTER SUBSTRUCTURE ; SPACE DENSITY PROFILES ; ANGULAR-MOMENTUM ; MERGER RATES ; GALAXIES ; CLUSTERS ; SUBHALOES ; EVOLUTION ; ORIGIN ; HISTORIES
Language英语
Funding ProjectNSFC[11222325] ; NSFC[11533006] ; NSFC[11621303] ; NSFC[11873038] ; NSFC[11890691] ; NSFC[11973032] ; Knowledge Innovation Program of CAS[KJCX2-EW-J01] ; Shanghai talent development funding[2011069] ; National Key Basic Research and Development Program of China[2018YFA0404504] ; 111 project[B20019] ; Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education
Funding OrganizationNSFC ; NSFC ; Knowledge Innovation Program of CAS ; Knowledge Innovation Program of CAS ; Shanghai talent development funding ; Shanghai talent development funding ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; 111 project ; 111 project ; Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education ; Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education ; NSFC ; NSFC ; Knowledge Innovation Program of CAS ; Knowledge Innovation Program of CAS ; Shanghai talent development funding ; Shanghai talent development funding ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; 111 project ; 111 project ; Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education ; Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education ; NSFC ; NSFC ; Knowledge Innovation Program of CAS ; Knowledge Innovation Program of CAS ; Shanghai talent development funding ; Shanghai talent development funding ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; 111 project ; 111 project ; Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education ; Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education ; NSFC ; NSFC ; Knowledge Innovation Program of CAS ; Knowledge Innovation Program of CAS ; Shanghai talent development funding ; Shanghai talent development funding ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; 111 project ; 111 project ; Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education ; Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000603161100001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/80463
Collection中国科学院国家天文台
Corresponding AuthorLi, Zhao-Zhou
Affiliation1.Shanghai Jiao Tong Univ, Sch Phys & Astron, Dept Astron, Shanghai 200240, Peoples R China
2.Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
3.Shanghai Key Lab Particle Phys & Cosmol, Shanghai 200240, Peoples R China
4.Shanghai Jiao Tong Univ, Tsung Dao Lee Inst, Shanghai 200240, Peoples R China
5.Korea Inst Adv Study KIAS, Sch Phys, 85 Hoegiro, Seoul 02455, South Korea
Recommended Citation
GB/T 7714
Li, Zhao-Zhou,Zhao, Dong-Hai,Jing, Y. P.,et al. Orbital Distribution of Infalling Satellite Halos across Cosmic Time[J]. ASTROPHYSICAL JOURNAL,2020,905(2):11.
APA Li, Zhao-Zhou,Zhao, Dong-Hai,Jing, Y. P.,Han, Jiaxin,&Dong, Fu-Yu.(2020).Orbital Distribution of Infalling Satellite Halos across Cosmic Time.ASTROPHYSICAL JOURNAL,905(2),11.
MLA Li, Zhao-Zhou,et al."Orbital Distribution of Infalling Satellite Halos across Cosmic Time".ASTROPHYSICAL JOURNAL 905.2(2020):11.
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