期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 448, 期 4, 页码 3391-3404出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stv231
关键词
gravitational lensing: weak; methods: numerical; cosmology: theory; large-scale structure of Universe
资金
- STFC
- Large Facilities Capital Fund of BIS
- Spin(e) of the French Agence Nationale de la Recherche [ANR-13-BS05-0005]
- ILP LABEX [ANR-10-LABX-63, ANR-11-IDEX-0004-02]
- ERC [267117]
- Swiss National Science Foundation
- Adrian Beecroft
- Oxford Martin School
- STFC [ST/H008896/1, ST/M006948/1, ST/K000373/1] Funding Source: UKRI
The intrinsic alignment of galaxy shapes (by means of their angular momentum) and their cross-correlation with the surrounding dark matter tidal field are investigated using the 160 000, z = 1.2 synthetic galaxies extracted from the high-resolution cosmological hydrodynamical simulation HORIZON-AGN. One-and two-point statistics of the spin of the stellar component are measured as a function of mass and colour. For the low-mass galaxies, this spin is locally aligned with the tidal field 'filamentary' direction while, for the high-mass galaxies, it is perpendicular to both filaments and walls. The bluest galaxies of our synthetic catalogue are more strongly correlated with the surrounding tidal field than the reddest galaxies, and this correlation extends up to similar to 10 h(-1) Mpc comoving distance. We also report a correlation of the projected ellipticities of blue, intermediate-mass galaxies on a similar scale at a level of 10(-4) which could be a concern for cosmic shear measurements. We do not report any measurable intrinsic alignments of the reddest galaxies of our sample. This work is a first step towards the use of very realistic catalogue of synthetic galaxies to evaluate the contamination of weak lensing measurement by the intrinsic galactic alignments.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据