INTRINSIC ELLIPTICITY CORRELATION OF SDSS LUMINOUS RED GALAXIES AND MISALIGNMENT WITH THEIR HOST DARK MATTER HALOS
文献类型：期刊论文
| 作者 | Okumura, Teppei1; Jing, Y. P.1; Li, Cheng1,2 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2009-03-20 |
| 卷号 | 694期号:1页码:214-221 |
| 关键词 | cosmology: observations galaxies: elliptical and lenticular galaxies: formation galaxies: halos large-scale structure of universe methods: statistical cD |
| 英文摘要 | We investigate the orientation correlation of giant elliptical galaxies by measuring the intrinsic ellipticity correlation function of 83,773 luminous red galaxies (LRGs) at redshifts 0.16-0.47 from the Sloan Digital Sky Survey. We have accurately determined the correlation up to 30 h(-1) Mpc. Luminosity dependence of the ellipticity correlation is also detected although the error bars are large, while no evidence is found for its redshift evolution between z = 0.2 and z = 0.4. Then we use a cosmological N-body simulation to examine misalignment between the central LRGs and their parent dark matter halos. Central and satellite galaxies are assigned to simulated halos by employing a halo occupation distribution model for the LRGs. The ellipticity correlation is predicted to have the same shape as, but an amplitude about four times higher than, our observation if the central LRGs are perfectly aligned with their host halos. This indicates that the central LRG galaxies are preferentially but not perfectly aligned with their host halos. With the assumption that there is a misalignment angle between a central LRG and its host halo which follows a Gaussian distribution with a zero mean and a width sigma(theta), we obtain a tight constraint on the misalignment parameter, sigma(theta) = 35.4(-3.3)(+4.0) deg. This type of intrinsic ellipticity correlation, if not corrected, can lead to contamination at 5% level to the shear power spectrum in weak lensing surveys of limiting magnitude R(AB) = 24.5 if the source central galaxies follow the same misalignment distribution as the LRGs. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | 星系与宇宙学研究中心 |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | DIGITAL SKY SURVEY ; WEAK-LENSING SURVEYS ; ANGULAR-MOMENTUM DISTRIBUTION ; N-BODY SIMULATIONS ; COSMIC SHEAR ; OCCUPATION DISTRIBUTION ; SATELLITE GALAXIES ; DENSITY CORRELATION ; POWER SPECTRUM ; DATA RELEASE |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000264291700021 |
| 公开日期 | 2010-11-08 |
| 源URL | [http://119.78.226.72//handle/331011/11867]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 2.Max Planck Inst Astrophys, D-85748 Garching, Germany |
| 推荐引用方式 GB/T 7714 | Okumura, Teppei,Jing, Y. P.,Li, Cheng. INTRINSIC ELLIPTICITY CORRELATION OF SDSS LUMINOUS RED GALAXIES AND MISALIGNMENT WITH THEIR HOST DARK MATTER HALOS[J]. ASTROPHYSICAL JOURNAL,2009,694(1):214-221. |
| APA | Okumura, Teppei,Jing, Y. P.,&Li, Cheng.(2009).INTRINSIC ELLIPTICITY CORRELATION OF SDSS LUMINOUS RED GALAXIES AND MISALIGNMENT WITH THEIR HOST DARK MATTER HALOS.ASTROPHYSICAL JOURNAL,694(1),214-221. |
| MLA | Okumura, Teppei,et al."INTRINSIC ELLIPTICITY CORRELATION OF SDSS LUMINOUS RED GALAXIES AND MISALIGNMENT WITH THEIR HOST DARK MATTER HALOS".ASTROPHYSICAL JOURNAL 694.1(2009):214-221. |
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来源：上海天文台
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