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Photometric and kinematic misalignments and their evolution among fast and slow rotators in the illustris simulation
Yang, Lisiyuan1,2; Xu, Dandan1,2,3; Mao, Shude1,2,4; Springel, Volker5; Li, Hongyu4,6
2019-10-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume489Issue:1Pages:534-547
AbstractWe use the Illustris simulation to study the distributions of ellipticities and kinematic misalignments of galactic projections, as well as the intrinsic shapes and rotation of the simulated galaxies. Our results for the projections of galaxies display clear trends of an overall increase of kinematic misalignment and a slight decrease of ellipticity for fast rotators with increasingmasses, while revealing no clear distinction between slow rotators of different mass. It is also found that the number of very slow rotators with large ellipticities is much larger than found in observations. The intrinsic properties of the galaxies are then analysed. The results for the intrinsic shapes of the galaxies are mostly consistent with previous results inferred from observational data. The distributions of intrinsic misalignment of the galaxies suggest that some of the galaxies produced by Illustris have significant rotation around their medium axes. Further analysis reveals that most of these galaxies display signs of non-equilibrium. We then study the evolution of the intrinsic misalignments and shapes of three specific Illustris galaxies, which we consider as typical ones, along the main progenitor line of their merger trees, revealing how mergers influence the intrinsic shapes and kinematics: the spin axis in general stays close to the shortest axis, and tends to quickly relax to such an equilibrium state within a few dynamical times of the galaxy after major perturbations; triaxiality and intrinsic flatness in general decrease with time, however, sometimes increases occur that are clearly seen to correlate with major merger events.
Keywordgalaxies: evolution galaxies: fundamental parameters galaxies: kinematics and dynamics galaxies: photometry galaxies: stellar content galaxies: structure
Funding OrganizationTsinghua University Initiative Scientific Research Program ; Tsinghua University Initiative Scientific Research Program ; DFG ; DFG ; NSFC ; NSFC ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; Tsinghua University Initiative Scientific Research Program ; Tsinghua University Initiative Scientific Research Program ; DFG ; DFG ; NSFC ; NSFC ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; Tsinghua University Initiative Scientific Research Program ; Tsinghua University Initiative Scientific Research Program ; DFG ; DFG ; NSFC ; NSFC ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; Tsinghua University Initiative Scientific Research Program ; Tsinghua University Initiative Scientific Research Program ; DFG ; DFG ; NSFC ; NSFC ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China
DOI10.1093/mnras/stz2156
WOS KeywordEARLY-TYPE GALAXIES ; STELLAR ANGULAR-MOMENTUM ; TO-LIGHT RATIO ; ATLAS(3D) PROJECT ; INTRINSIC SHAPE ; SAURON PROJECT ; MERGER REMNANTS ; MASSIVE SURVEY ; DARK-MATTER ; RADIUS
Language英语
Funding ProjectTsinghua University Initiative Scientific Research Program[20181080300] ; DFG[11761131004] ; NSFC[11761131004] ; National Key Basic Research and Development Program of China[2018YFA0404501]
Funding OrganizationTsinghua University Initiative Scientific Research Program ; Tsinghua University Initiative Scientific Research Program ; DFG ; DFG ; NSFC ; NSFC ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; Tsinghua University Initiative Scientific Research Program ; Tsinghua University Initiative Scientific Research Program ; DFG ; DFG ; NSFC ; NSFC ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; Tsinghua University Initiative Scientific Research Program ; Tsinghua University Initiative Scientific Research Program ; DFG ; DFG ; NSFC ; NSFC ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; Tsinghua University Initiative Scientific Research Program ; Tsinghua University Initiative Scientific Research Program ; DFG ; DFG ; NSFC ; NSFC ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000489292800039
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/28031
Collection中国科学院国家天文台
Corresponding AuthorYang, Lisiyuan
Affiliation1.Tsinghua Univ, Phys Dept, Beijing 100084, Peoples R China
2.Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China
3.Tsinghua Univ, Inst Adv Study, Beijing 100084, Peoples R China
4.Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 100012, Peoples R China
5.Max Planck Inst Astrophys, Karl Schwarzschild Str 1, D-85740 Garching, Germany
6.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Yang, Lisiyuan,Xu, Dandan,Mao, Shude,et al. Photometric and kinematic misalignments and their evolution among fast and slow rotators in the illustris simulation[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,489(1):534-547.
APA Yang, Lisiyuan,Xu, Dandan,Mao, Shude,Springel, Volker,&Li, Hongyu.(2019).Photometric and kinematic misalignments and their evolution among fast and slow rotators in the illustris simulation.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,489(1),534-547.
MLA Yang, Lisiyuan,et al."Photometric and kinematic misalignments and their evolution among fast and slow rotators in the illustris simulation".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 489.1(2019):534-547.
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