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The origin and properties of massive prolate galaxies in the Illustris simulation
Li, Hongyu1,2; Mao, Shude1,3,4,5; Emsellem, Eric6,7,8; Xu, Dandan9; Springel, Volker9,10; Krajnovic, Davor11
2018
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume473Issue:2Pages:1489-1511
AbstractWe study galaxy shapes in the Illustris cosmological hydrodynamic simulation. We find that massive galaxies have a higher probability of being prolate. For galaxies with stellar mass larger than 1011M(circle dot), 35 out of total 839 galaxies are prolate. For 21 galaxies with stellar mass larger than 1012M(circle dot), 9 are prolate, 4 are triaxial while the others are close to being oblate. There are almost no prolate galaxies with stellar mass smaller than 3 x 1011M(circle dot). We check the merger history of the prolate galaxies, and find that they are formed by major dry mergers. All the prolate galaxies have at least one such merger, with most having mass ratios between 1: 1 and 1: 3. The gas fraction (gas mass to total baryon mass) of the progenitors is 0- 3 per cent per cent for nearly all these mergers, except for one whose second progenitor contains similar to 15 per cent gas mass, while its main progenitor still contains less than 5 per cent. For the 35 massive prolate galaxies that we find, 18 of them have minor-axis rotation, and their angular momenta mostly come from the spin angular momenta of the progenitors (usually that of the main progenitor). We analyse the merger orbits of these prolate galaxies and find that most of them experienced a nearly radial merger orbit. Oblate galaxies with major dry mergers can have either radial or circular merger orbits. We further discuss various properties of these prolate galaxies, such as spin parameter.R, spherical anisotropy parameter beta, dark matter fraction, as well as inner density slopes for the stellar, dark matter and total mass distributions.
Keywordgalaxies: evolution galaxies: formation galaxies: structure
Funding OrganizationNational Science Foundation of China ; National Science Foundation of China ; European Research Council under ERCStG grant ; European Research Council under ERCStG grant ; National Science Foundation of China ; National Science Foundation of China ; European Research Council under ERCStG grant ; European Research Council under ERCStG grant ; National Science Foundation of China ; National Science Foundation of China ; European Research Council under ERCStG grant ; European Research Council under ERCStG grant ; National Science Foundation of China ; National Science Foundation of China ; European Research Council under ERCStG grant ; European Research Council under ERCStG grant
DOI10.1093/mnras/stx2374
WOS KeywordGAUSSIAN EXPANSION METHOD ; STELLAR ANGULAR-MOMENTUM ; MINOR-AXIS ROTATION ; ATLAS(3D) PROJECT ; DARK-MATTER ; SLOW ROTATORS ; ELLIPTIC GALAXIES ; DENSITY PROFILES ; INTRINSIC SHAPES ; MERGER REMNANTS
Language英语
Funding ProjectNational Science Foundation of China[11333003] ; National Science Foundation of China[11390372] ; European Research Council under ERCStG grant[EXAGAL-308037]
Funding OrganizationNational Science Foundation of China ; National Science Foundation of China ; European Research Council under ERCStG grant ; European Research Council under ERCStG grant ; National Science Foundation of China ; National Science Foundation of China ; European Research Council under ERCStG grant ; European Research Council under ERCStG grant ; National Science Foundation of China ; National Science Foundation of China ; European Research Council under ERCStG grant ; European Research Council under ERCStG grant ; National Science Foundation of China ; National Science Foundation of China ; European Research Council under ERCStG grant ; European Research Council under ERCStG grant
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000423731200006
PublisherOXFORD UNIV PRESS
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/37418
Collection中国科学院国家天文台
Corresponding AuthorLi, Hongyu
Affiliation1.Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 100012, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Tsinghua Univ, Phys Dept, Beijing 100084, Peoples R China
4.Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China
5.Univ Manchester, Sch Phys & Astron, Jodrell Bank Ctr Astrophys, Oxford Rd, Manchester M13 9PL, Lancs, England
6.Univ Lyon 1, Observ Lyon, Ctr Rech Astrophys Lyon, 9 Ave Charles Andre, F-69230 St Genis Laval, France
7.Univ Lyon 1, Ecole Normale Super Lyon, 9 Ave Charles Andre, F-69230 St Genis Laval, France
8.European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany
9.Heidelberg Inst Theoret Studies, Schloss Wolfsbrunnenweg 35, D-69118 Heidelberg, Germany
10.Heidelberg Univ, Zentrum Astron, ARI, Monchhofstr 12-14, D-69120 Heidelberg, Germany
11.Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany
Recommended Citation
GB/T 7714
Li, Hongyu,Mao, Shude,Emsellem, Eric,et al. The origin and properties of massive prolate galaxies in the Illustris simulation[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,473(2):1489-1511.
APA Li, Hongyu,Mao, Shude,Emsellem, Eric,Xu, Dandan,Springel, Volker,&Krajnovic, Davor.(2018).The origin and properties of massive prolate galaxies in the Illustris simulation.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,473(2),1489-1511.
MLA Li, Hongyu,et al."The origin and properties of massive prolate galaxies in the Illustris simulation".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 473.2(2018):1489-1511.
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