Probing the intrinsic shape and alignment of dark matter haloes using SDSS galaxy groups
文献类型：期刊论文
| 作者 | Wang, Yougang1 ; Yang, Xiaohu2,5; Mo, H. J.3; Li, Cheng2,4,5; van den Bosch, Frank C.6; Fan, Zuhui7; Chen, Xuelei1
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2008-04-11 |
| 卷号 | 385期号:3页码:1511-1522 |
| 关键词 | methods : statistical galaxies : haloes galaxies : structure dark matter large-scale structure of Universe |
| 英文摘要 | We study the three-dimensional and projected shapes of galaxy groups in the Sloan Digital Sky Survey Data Release 4, and examine the alignment between the orientation of the central galaxy and the spatial distribution of satellite galaxies. The projected ellipticity of a group is measured using the moments of the discrete distribution of its member galaxies. We infer the three-dimensional and projected axis ratios of their dark matter haloes by comparing the measured ellipticity distributions with those obtained from Monte Carlo simulations of projected, triaxial dark matter haloes with different axis ratios. We find that the halo shape has a strong dependence on the halo mass. While the haloes of low-mass groups are nearly spherical, those of massive groups tend to be prolate. For groups containing at least four members, the statistical distribution of their measured ellipticities does not have a strong dependence on the colours of their central galaxies. Our analysis further shows that the average three-dimensional axis ratio for haloes with 12 < log[M/(h(-1) M-circle dot)<= 15 is about 1 : 0.46 : 0.46, resulting in a projected axis ratio of similar to 0.77. Our results for the alignment between the orientation of the central galaxy of a group and the distribution of their satellite galaxies are in broad agreement with those obtained by Yang et al. The distribution of satellite galaxies preferentially aligns with the major axis of the central galaxy, with a clear dependence on both halo mass and galaxy colours. In particular, the alignment is stronger in more massive groups, and the strongest alignment is seen between red centrals and the distribution of red satellites. For groups with blue centrals, no significant alignment is detected. Finally, we examine how the observed alignment can be reproduced with the information about the halo axis ratios. The observed alignment signal can be reproduced if the angle between the major axis of the central galaxy and the projected major axis of the host halo has a Gaussian distribution with a mean of 0 degrees and a dispersion of similar to 23 degrees. This dispersion is larger for groups with blue centrals than those with red centrals. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000254604600031 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7361]  |
| 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, Beijing 100012, Peoples R China 2.Shanghai Astron Observ, Joint Inst Galaxy & Cosmol, Partner Grp MPA, Shanghai 200030, Peoples R China 3.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA 4.Max Planck Inst Astrophys, D-85748 Garching, Germany 5.Univ Sci & Technol China, Ctr Astrophys, Anhua 230026, Peoples R China 6.Max Planck Inst Astron, D-69117 Heidelberg, Germany 7.Peking Univ, Dept Astron, Beijing 100871, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Yougang,Yang, Xiaohu,Mo, H. J.,et al. Probing the intrinsic shape and alignment of dark matter haloes using SDSS galaxy groups[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2008,385(3):1511-1522. |
| APA | Wang, Yougang.,Yang, Xiaohu.,Mo, H. J..,Li, Cheng.,van den Bosch, Frank C..,...&Chen, Xuelei.(2008).Probing the intrinsic shape and alignment of dark matter haloes using SDSS galaxy groups.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,385(3),1511-1522. |
| MLA | Wang, Yougang,et al."Probing the intrinsic shape and alignment of dark matter haloes using SDSS galaxy groups".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 385.3(2008):1511-1522. |
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