Alignments between galaxies, satellite systems and haloes
文献类型：期刊论文
| 作者 | Shao, Shi1,2 ; Cautun, Marius2; Frenk, Carlos S.2; Gao, Liang1,2; Crain, Robert A.; Schaller, Matthieu2; Schaye, Joop; Theuns, Tom2
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2016-08-21 |
| 卷号 | 460期号:4页码:3772-3783 |
| 关键词 | methods: numerical galaxies: haloes galaxies: kinematics and dynamics |
| 英文摘要 | The spatial distribution of the satellite populations of the Milky Way and Andromeda are puzzling in that they are nearly perpendicular to the discs of their central galaxies. To understand the origin of such configurations we study the alignment of the central galaxy, satellite system and dark matter halo in the largest of the 'Evolution and Assembly of GaLaxies and their Environments' (eagle) simulation. We find that centrals and their satellite systems tend to be well aligned with their haloes, with a median misalignment angle of 33A degrees in both cases. While the centrals are better aligned with the inner 10 kpc halo, the satellite systems are better aligned with the entire halo indicating that satellites preferentially trace the outer halo. The central-satellite alignment is weak (median misalignment angle of 52A degrees) and we find that around 20 per cent of systems have a misalignment angle larger than 78A degrees, which is the value for the Milky Way. The central-satellite alignment is a consequence of the tendency of both components to align with the dark matter halo. As a consequence, when the central is parallel to the satellite system, it also tends to be parallel to the halo. In contrast, if the central is perpendicular to the satellite system, as in the case of the Milky Way and Andromeda, then the central-halo alignment is much weaker. Dispersion-dominated (spheroidal) centrals have a stronger alignment with both their halo and their satellites than rotation-dominated (disc) centrals. We also found that the halo, the central galaxy and the satellite system tend to be aligned with the surrounding large-scale distribution of matter, with the halo being the better aligned of the three. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | COLD DARK-MATTER ; COSMO-OWLS SIMULATIONS ; LARGE-SCALE STRUCTURE ; MILKY-WAY SATELLITES ; LOCAL GROUP ; ANDROMEDA GALAXY ; DWARF GALAXIES ; COSMOLOGICAL SIMULATIONS ; HYDRODYNAMIC SIMULATIONS ; ANISOTROPIC DISTRIBUTION |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000381711100030 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6792]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Partner Grp, Max Planck Inst Astrophys, Beijing 100012, Peoples R China 2.Univ Durham, Dept Phys, Inst Computat Cosmol, South Rd, Durham DH1 3LE, England |
| 推荐引用方式 GB/T 7714 | Shao, Shi,Cautun, Marius,Frenk, Carlos S.,et al. Alignments between galaxies, satellite systems and haloes[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,460(4):3772-3783. |
| APA | Shao, Shi.,Cautun, Marius.,Frenk, Carlos S..,Gao, Liang.,Crain, Robert A..,...&Theuns, Tom.(2016).Alignments between galaxies, satellite systems and haloes.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,460(4),3772-3783. |
| MLA | Shao, Shi,et al."Alignments between galaxies, satellite systems and haloes".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 460.4(2016):3772-3783. |
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来源：国家天文台
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