The phase-space parameters of the brightest halo galaxies
文献类型：期刊论文
| 作者 | van den Bosch, FC; Weinmann, SM; Yang, XH; Mo, HJ; Li, C ; Jing, YP
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2005-08-21 |
| 卷号 | 361期号:4页码:1203-1215 |
| 关键词 | methods : statistical galaxies : haloes galaxies : kinematics and dynamics dark matter |
| 英文摘要 | The brightest galaxy in a dark matter halo is expected to reside at rest at the centre of the halo. In this paper, we test this 'Central Galaxy Paradigm' (CGP) using group catalogues extracted from the Two-Degree Field Galaxy Redshift Survey (2dFGRS) and the Sloan Digital Sky Survey (SDSS). For each group, we compute a parameter R, which is defined as the difference between the velocity of the brightest group galaxy and the average velocity of the other group members (hereafter satellites), normalized by the unbiased estimator of the velocity dispersion of the satellite galaxies. Because the redshift surveys suffer from incompleteness effects and the group selection criterion unavoidably selects interlopers, a proper comparison between data and model needs to take this into account. To this extent, we use detailed mock galaxy redshift surveys (MGRSs), which are analysed in exactly the same way as the data, thus allowing for a fair comparison. We show that the CGP is only consistent with the data in haloes with M less than or similar to 10(13) h(-1) M circle dot, while in more massive haloes the data indicate a non-zero offset between the brightest galaxy and the satellites. This indicates that either central galaxies reside at the minimum of the dark matter potential, but that the halo itself is not yet fully relaxed, or, that the halo is relaxed, but that the central galaxy oscillates in its potential well. The former is consistent with the fact that the velocity bias of the brightest halo galaxies is larger in more massive haloes, while the latter may be indicative of cored, rather than cusped, dark matter haloes. We discuss several implications of these findings, including mass estimates based on satellite kinematics, strong gravitational lensing, halo occupation models, and the frequency and longevity of lopsidedness in disc galaxies. |
| 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 ; SURFACE BRIGHTNESS GALAXIES ; DIGITAL SKY SURVEY ; SPIRAL GALAXIES ; REDSHIFT SURVEY ; LUMINOSITY FUNCTION ; ROTATION CURVES ; HIGH-RESOLUTION ; ABELL CLUSTERS ; CD CLUSTERS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000231459500011 |
| 源URL | [http://119.78.226.72/handle/331011/19369]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.ETH Honggerberg, Swiss Fed Inst Technol, Dept Phys, CH-8093 Zurich, Switzerland 2.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA 3.Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Peoples R China 4.Partner Grp MPA, Shanghai Astron Observ, Shanghai 200030, Peoples R China |
| 推荐引用方式 GB/T 7714 | van den Bosch, FC,Weinmann, SM,Yang, XH,et al. The phase-space parameters of the brightest halo galaxies[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2005,361(4):1203-1215. |
| APA | van den Bosch, FC,Weinmann, SM,Yang, XH,Mo, HJ,Li, C,&Jing, YP.(2005).The phase-space parameters of the brightest halo galaxies.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,361(4),1203-1215. |
| MLA | van den Bosch, FC,et al."The phase-space parameters of the brightest halo galaxies".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 361.4(2005):1203-1215. |
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