The alignment between satellites and central galaxies: theory versus observations
文献类型：期刊论文
| 作者 | Kang, X.; van den Bosch, Frank C.; Yang, Xiaohu; Mao, Shude; Mo, H. J.; Li, Cheng; Jing, Y. P. |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2007-07-11 |
| 卷号 | 378期号:4页码:1531-1542 |
| 关键词 | methods : statistical galaxies : haloes galaxies : structure dark matter large-scale structure of Universe |
| 英文摘要 | Recent studies have shown that the distribution of satellite galaxies is preferentially aligned with the major axis of their central galaxy. The strength of this alignment has been found to depend strongly on the colours of the satellite and central galaxies, and only weakly on the mass of the halo in which the galaxies reside. In this paper we study whether these alignment signals, and their dependence on galaxy and halo properties, can be reproduced in a hierarchical structure formation model of a Lambda CDM concordance cosmology. To that extent we use a large N-body simulation which we populate with galaxies following a semi-analytical model for galaxy formation. We find that if the orientation of the central galaxy is perfectly aligned with that of its dark matter halo, then the predicted central-satellite alignment signal is much stronger than observed. If, however, the minor axis of a central galaxy is perfectly aligned with the angular momentum vector of its dark matter halo, we can accurately reproduce the observed alignment strength as a function of halo mass and galaxy colour. Although this suggests that the orientation of central galaxies is governed by the angular momentum of their dark matter haloes, we emphasize that any other scenario in which the minor axes of central galaxy and halo are misaligned by similar to 40 degrees (on average) will match the data equally well. Finally, we show that dependence of the alignment strength on the colour of the central galaxy is most likely an artefact due to interlopers in the group catalogue. The dependence on the colour of the satellite galaxies, on the other hand, is real and owes to the fact that red satellites are associated with subhaloes that were more massive at their time of accretion. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | DARK-MATTER HALOES ; DIGITAL SKY SURVEY ; ANGULAR-MOMENTUM DISTRIBUTION ; ABELL CLUSTER SURVEY ; N-BODY SIMULATIONS ; DISK GALAXIES ; LAMBDA-CDM ; ANISOTROPIC DISTRIBUTION ; SEMIANALYTICAL MODEL ; GALACTIC SATELLITES |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000247667900030 |
| 源URL | [http://119.78.226.72/handle/331011/19454]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Max Planck Inst Astron, D-69117 Heidelberg, Germany 2.Univ Oxford, Dept Astrophys, Oxford OX1 3RH, England 3.Shanghai Astron Observ, Partner Grp MPA, Shanghai 200030, Peoples R China 4.Univ Manchester, Jodrell Bank, Macclesfield SK11 9DL, Cheshire, England 5.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA 6.Max Planck Inst Astrophys, D-85741 Garching, Germany |
| 推荐引用方式 GB/T 7714 | Kang, X.,van den Bosch, Frank C.,Yang, Xiaohu,et al. The alignment between satellites and central galaxies: theory versus observations[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2007,378(4):1531-1542. |
| APA | Kang, X..,van den Bosch, Frank C..,Yang, Xiaohu.,Mao, Shude.,Mo, H. J..,...&Jing, Y. P..(2007).The alignment between satellites and central galaxies: theory versus observations.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,378(4),1531-1542. |
| MLA | Kang, X.,et al."The alignment between satellites and central galaxies: theory versus observations".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 378.4(2007):1531-1542. |
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