The cross-correlation between galaxies and groups: probing the galaxy distribution in and around dark matter haloes
文献类型：期刊论文
| 作者 | Yang, XH; Mo, HJ; van den Bosch, FC; Weinmann, SM; 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 | 2005-09-11 |
| 卷号 | 362期号:2页码:711-726 |
| 关键词 | methods : statistical galaxies : haloes dark matter large-scale structure of Universe |
| 英文摘要 | We determine cross-correlation function between galaxies and galaxy groups, using both the Two-Degree Field Galaxy Redshift Survey (2dFGRS) and the Sloan Digital Sky Survey (SDSS). Groups are identified using the halo-based group finder developed by Yang et al., which is optimized to associate to a group those galaxies which belong to the same dark matter halo. Our galaxy-group cross-correlation function is therefore a surrogate for the galaxy-halo cross-correlation function. We study the cross-correlation as a function of group mass, and as a function of the luminosity, stellar mass, colour, spectral type and specific star formation rate of the galaxies. All these cross-correlation functions show a clear transition from the 'one-halo' to the 'two-halo' regimes on a scale comparable to the virial radius of the groups under consideration. On scales larger than the virial radius, all cross-correlation functions are roughly parallel, consistent with the linear bias model. In particular, the large-scale correlation amplitudes are higher for more massive groups, and for brighter and redder galaxies. In the 'one-halo' regime, the cross-correlation function depends strongly on the definition of the group centre. We consider both a luminosity-weighted centre (LW centre) and a centre defined by the location of the brightest group galaxy (BG centre). With the first definition, the bright early-type galaxies in massive groups are found to be more centrally concentrated than the fainter, late-type galaxies. Using the BG centre, and excluding the brightest galaxy from the cross-correlation analysis, we only find significant segregation in massive groups (M greater than or similar to 10(13)h(-1) M-circle dot) for galaxies of different spectral types (or colours or specific star formation rates). In haloes with masses less than or similar to 10(13)h(-1) M-circle dot, there is a significant deficit of bright satellite galaxies. Comparing the results from the 2dFGRS with those obtained from realistic mock samples, we find that the distribution of galaxies in groups is much less concentrated than dark matter haloes predicted by the current Lambda CDM model. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | DIGITAL SKY SURVEY ; MORPHOLOGY-DENSITY RELATION ; REDSHIFT SURVEY ; LUMINOSITY FUNCTION ; OCCUPATION DISTRIBUTION ; STAR-FORMATION ; SPECTRAL TYPE ; VELOCITY DISPERSION ; RADIAL-DISTRIBUTION ; ANALYTIC MODEL |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000231509900029 |
| 源URL | [http://119.78.226.72/handle/331011/19373]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA 2.ETH Honggerberg, Swiss Fed Inst Technol, Dept Phys, CH-8093 Zurich, Switzerland 3.Univ Sci & Technol China, Ctr Astrophys, Anhua 230026, Peoples R China 4.Shanghai Astron Observ, Shanghai 200030, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yang, XH,Mo, HJ,van den Bosch, FC,et al. The cross-correlation between galaxies and groups: probing the galaxy distribution in and around dark matter haloes[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2005,362(2):711-726. |
| APA | Yang, XH,Mo, HJ,van den Bosch, FC,Weinmann, SM,Li, C,&Jing, YP.(2005).The cross-correlation between galaxies and groups: probing the galaxy distribution in and around dark matter haloes.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,362(2),711-726. |
| MLA | Yang, XH,et al."The cross-correlation between galaxies and groups: probing the galaxy distribution in and around dark matter haloes".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 362.2(2005):711-726. |
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来源：上海天文台
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