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Evaluating the ability of triaxial Schwarzschild modelling to estimate properties of galaxies from the Illustris simulation

文献类型：期刊论文

作者Jin, Yunpeng7,8; Zhu, Ling1; Long, R. J.2,3,6,7; Mao, Shude2,3,7; Xu, Dandan2,3; Li, Hongyu7; van de Ven, Glenn4,5
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2019-07-01
卷号486期号:4页码:4753-4772
ISSN号0035-8711
关键词galaxies: elliptical and lenticular, cD galaxies: kinematics and dynamics galaxies: structure galaxies: fundamental parameters
DOI10.1093/mnras/stz1170
英文摘要We evaluate the capabilities of Schwarzschild's orbit-superposition method by applying it to galaxies from the large-scale, high-resolution Illustris simulation. Nine early-type galaxies with a range of triaxiality are selected, and we create mock integral field unit data for five line of -sight projections of each galaxy. Each of the 45 mock data sets is taken as an independent observed galaxy. Using van den Bosch's 2008 triaxial Schwarzschild implementation, we assess model estimates of various galaxy properties, covering mass profiles, intrinsic shapes, stellar orbit distributions, and velocity anisotropies. Total mass within (R-e) over bar is recovered well with average deviations within +/- 15 per cent. Stellar mass is underestimated by similar to 24 per cent and dark matter overestimated by similar to 38 per cent (assuming an NFW dark matter profile and allowing for degeneracy between stellar mass and dark matter mass). Using a gNFW profile, these values improve to similar to 13 per cent for stellar mass and similar to 18 per cent for dark matter. Axis ratio estimates show a moderate bias of Delta(bla) = 0.07 and Delta(cla) = 0.14 (a >= b >= c). Distributions of the orbit circularities lambda(z) and lambda(x), representing rotation about the minor and major axes, are well reconstructed. Separating orbits into thermal categories, our models match the average fractions of these categories within 10 per cent. Velocity anisotropy is well estimated with values matching in the inner regions but becoming slightly radially biased in the outer regions. Overall, the galaxy property estimates we obtained using Schwarzschild modelling arc not implausible and arc representative of the simulated galaxies we modelled.
WOS关键词MULTI-GAUSSIAN EXPANSION ; SCALE-FREE MODELS ; TO-LIGHT RATIO ; SELF-CONSISTENT MODELS ; DARK-MATTER ; ELLIPTIC GALAXIES ; KINEMATICAL MODELS ; FUNDAMENTAL PLANE ; VELOCITY PROFILES ; DYNAMICAL MODELS
资助项目National Key Basic Research and Development Program of China[2018YFA0404501] ; National Science Foundation of China[11821303] ; National Science Foundation of China[11333003] ; National Science Foundation of China[11390372] ; National Science Foundation of China[11761131004] ; Shanghai Astronomical Observatory, Chinese Academy of Sciences[Y895201009] ; European Research Council (ERC) under the European Union[724857]
WOS研究方向Astronomy & Astrophysics
语种英语
出版者OXFORD UNIV PRESS
WOS记录号WOS:000474908200022
资助机构National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; Shanghai Astronomical Observatory, Chinese Academy of Sciences ; Shanghai Astronomical Observatory, Chinese Academy of Sciences ; European Research Council (ERC) under the European Union ; European Research Council (ERC) under the European Union ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; Shanghai Astronomical Observatory, Chinese Academy of Sciences ; Shanghai Astronomical Observatory, Chinese Academy of Sciences ; European Research Council (ERC) under the European Union ; European Research Council (ERC) under the European Union ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; Shanghai Astronomical Observatory, Chinese Academy of Sciences ; Shanghai Astronomical Observatory, Chinese Academy of Sciences ; European Research Council (ERC) under the European Union ; European Research Council (ERC) under the European Union ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; Shanghai Astronomical Observatory, Chinese Academy of Sciences ; Shanghai Astronomical Observatory, Chinese Academy of Sciences ; European Research Council (ERC) under the European Union ; European Research Council (ERC) under the European Union
源URL[http://ir.bao.ac.cn/handle/114a11/26894]  
专题中国科学院国家天文台
通讯作者Jin, Yunpeng; Zhu, Ling
作者单位1.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
2.Tsinghua Univ, Dept Astron, Beijing 100084, Peoples R China
3.Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China
4.European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany
5.Univ Vienna, Dept Astrophys, Turkenschanzstr 17, A-1180 Vienna, Austria
6.Univ Manchester, Sch Phys & Astron, Ctr Astrophys, Jodrell Bank, Oxford Rd, Manchester M13 9PL, Lancs, England
7.Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 100101, Peoples R China
8.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Jin, Yunpeng,Zhu, Ling,Long, R. J.,et al. Evaluating the ability of triaxial Schwarzschild modelling to estimate properties of galaxies from the Illustris simulation[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,486(4):4753-4772.
APA Jin, Yunpeng.,Zhu, Ling.,Long, R. J..,Mao, Shude.,Xu, Dandan.,...&van de Ven, Glenn.(2019).Evaluating the ability of triaxial Schwarzschild modelling to estimate properties of galaxies from the Illustris simulation.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,486(4),4753-4772.
MLA Jin, Yunpeng,et al."Evaluating the ability of triaxial Schwarzschild modelling to estimate properties of galaxies from the Illustris simulation".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 486.4(2019):4753-4772.

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