Alignment between galaxies and large-scale structure
文献类型：期刊论文
| 作者 | Faltenbacher, A.1,2; Li, Cheng1,2; White, Simon D. M.1; Jing, Yi-Peng2; Mao, Shu-De3; Wang, Jie4
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| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
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| 出版日期 | 2009 |
| 卷号 | 9期号:1页码:41-58 |
| 关键词 | dark matter halos: clustering galaxies: large scale structure of Universe cosmology: theory dark matter |
| 英文摘要 | Based on the Sloan Digital Sky Survey DR6 (SDSS) and the Millennium Simulation (MS), we investigate the alignment between galaxies and large-scale structure. For this purpose, we develop two new statistical tools, namely the alignment correlation function and the cos(2 theta)-statistic. The former is a two-dimensional extension of the traditional two-point correlation function and the latter is related to the ellipticity correlation function used for cosmic shear measurements. Both are based on the cross correlation between a sample of galaxies with orientations and a reference sample which represents the large-scale structure. We apply the new statistics to the SDSS galaxy catalog. The alignment correlation function reveals an overabundance of reference galaxies along the major axes of red, luminous (L L.) galaxies out to projected separations of 60 h(-1)Mpc. The signal increases with central galaxy luminosity. No alignment signal is detected for blue galaxies. The cos(20)-statistic yields very similar results. Starting from a MS semi-analytic galaxy catalog, we assign an orientation to each red, luminous and central galaxy, based on that of the central region of the host halo (with size similar to that of the stellar galaxy). As an alternative, we use the orientation of the host halo itself. We find a mean projected misalignment between a halo and its central region of similar to 25 degrees. The misalignment decreases slightly with increasing luminosity of the central galaxy. Using the orientations and luminosities of the semi-analytic galaxies, we repeat our alignment analysis on mock surveys of the MS. Agreement with the SDSS results is good if the central orientations are used. Predictions using the halo orientations as proxies for central galaxy orientations overestimate the observed alignment by more than a factor of 2. Finally, the large volume of the MS allows us to generate a two-dimensional map of the alignment correlation function, which shows the reference galaxy distribution to be flattened parallel to the orientations of red luminous galaxies with axis ratios of similar to 0.5 and similar to 0.75 for halo and central orientations, respectively. These ratios are almost independent of scale out to 60 h(-1)Mpc. |
| 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 ; WEAK-LENSING SURVEYS ; DARK-MATTER HALOES ; DATA RELEASE ; INTRINSIC CORRELATION ; SATELLITE GALAXIES ; CLUSTER GALAXIES ; RADIAL ALIGNMENT ; SIMULATIONS ; MORPHOLOGY |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000264770600004 |
| 源URL | [http://119.78.226.72/handle/331011/19342]  |
| 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 Astrophys, D-85741 Garching, Germany 2.Shanghai Astron Observ, MPA SHAO Joint Ctr Astrophys Cosmol, Shanghai 200030, Peoples R China 3.Univ Manchester, Jodrell Bank, Ctr Astrophys, Manchester M13 9PL, Lancs, England 4.Univ Durham, Dept Phys, Inst Computat Cosmol, Sci Labs, Durham DH1 3LE, England |
| 推荐引用方式 GB/T 7714 | Faltenbacher, A.,Li, Cheng,White, Simon D. M.,et al. Alignment between galaxies and large-scale structure[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2009,9(1):41-58. |
| APA | Faltenbacher, A.,Li, Cheng,White, Simon D. M.,Jing, Yi-Peng,Mao, Shu-De,&Wang, Jie.(2009).Alignment between galaxies and large-scale structure.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,9(1),41-58. |
| MLA | Faltenbacher, A.,et al."Alignment between galaxies and large-scale structure".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 9.1(2009):41-58. |
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来源：上海天文台
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