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题名: NIHAO VI. The hidden discs of simulated galaxies
作者: Obreja, Aura1, 2; Stinson, Gregory S.2; Dutton, Aaron A.1, 2; Maccio, Andrea V.1, 2; Wang, Liang2, 3, 4; Kang Xi(康熙)3, 4
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2016-06-11
卷号: 459, 期号:1, 页码:467-486
关键词: methods: numerical ; galaxies: fundamental parameters ; galaxies: kinematics and dynamics ; galaxies: stellar content ; galaxies: structure
DOI: 10.1093/mnras/stw690
文章类型: Article
英文摘要: Detailed studies of galaxy formation require clear definitions of the structural components of galaxies. Precisely defined components also enable better comparisons between observations and simulations. We use a subsample of 18 cosmological zoom-in simulations from the Numerical Investigation of a Hundred Astrophysical Objects (NIHAO) project to derive a robust method for defining stellar kinematic discs in galaxies. Our method uses Gaussian Mixture Models in a 3D space of dynamical variables. The NIHAO galaxies have the right stellar mass for their halo mass, and their angular momenta and Sersic indices match observations. While the photometric disc-to-total ratios are close to 1 for all the simulated galaxies, the kinematic ratios are around similar to 0.5. Thus, exponential structure does not imply a cold kinematic disc. Above M-* similar to 10(9.5) M-circle dot, the decomposition leads to thin discs and spheroids that have clearly different properties, in terms of angular momentum, rotational support, ellipticity, [Fe/H] and [O/Fe]. At M-* less than or similar to 10(9.5) M-circle dot, the decomposition selects discs and spheroids with less distinct properties. At these low masses, both the discs and spheroids have exponential profiles with high minor-to-major axes ratios, i.e. thickened discs.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: SMOOTHED-PARTICLE HYDRODYNAMICS ; DARK-MATTER UNIVERSE ; EDGE-ON GALAXIES ; STELLAR FEEDBACK ; SPIRAL GALAXIES ; GALACTIC DISKS ; MINOR MERGERS ; THICK DISKS ; ELLIPTIC GALAXIES ; ANGULAR-MOMENTUM
收录类别: SCI
项目资助者: German Research Foundation (DFG)(Sonderforschungsbereich SFB 881) ; European Research Council under the European Union(321035) ; NSFC(11333008) ; CAS(XDB09000000)
语种: 英语
WOS记录号: WOS:000376386600037
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16220
Appears in Collections:南极天文中心_期刊论文

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作者单位: 1.New York Univ Abu Dhabi, POB 129188, Abu Dhabi, U Arab Emirates
2.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
3.Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Peoples R China
4.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
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