NIHAO VI. The hidden discs of simulated galaxies
文献类型：期刊论文
| 作者 | Obreja, Aura1,2; Stinson, Gregory S.2; Dutton, Aaron A.1,2; Maccio, Andrea V.1,2; Wang, Liang2,3,4; Kang, Xi3,4
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 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 |
| 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 |
| 语种 | 英语 |
| WOS记录号 | WOS:000376386600037 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/16220]  |
| 专题 | 紫金山天文台_南极天文中心 |
| 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 |
| 推荐引用方式 GB/T 7714 | Obreja, Aura,Stinson, Gregory S.,Dutton, Aaron A.,et al. NIHAO VI. The hidden discs of simulated galaxies[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,459(1):467-486. |
| APA | Obreja, Aura,Stinson, Gregory S.,Dutton, Aaron A.,Maccio, Andrea V.,Wang, Liang,&Kang, Xi.(2016).NIHAO VI. The hidden discs of simulated galaxies.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,459(1),467-486. |
| MLA | Obreja, Aura,et al."NIHAO VI. The hidden discs of simulated galaxies".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 459.1(2016):467-486. |
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来源：紫金山天文台
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