Redshift and luminosity evolution of the intrinsic alignments of galaxies in Horizon-AGN
Redshift and luminosity evolution of the intrinsic alignments of galaxies in Horizon-AGN
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DOI：
10.1093/mnras/stw1409
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发表时间：
2016-02
影响因子：
4.8
通讯作者：
N. E. Chisari;C. Laigle;S. Codis;Y. Dubois;J. Devriendt;L. Miller;K. Benabed;A. Slyz;R. Gavazzi-R
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文献类型：
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作者：
N. E. Chisari;C. Laigle;S. Codis;Y. Dubois;J. Devriendt;L. Miller;K. Benabed;A. Slyz;R. Gavazzi-R
由于潮汐相互作用或星系形成过程，内在星系形状和角动量排列可以出现在宇宙学大尺度结构中。宇宙流体动力学模拟最近已经成为研究这些排列及其对弱引力透镜的污染的工具。本文研究了r带绝对星等为1 Mpc的星系在z=0和z=3之间的视界活动星系核内禀排列的红移和光度演化。圆盘的排列在投影中为零，与目前的低红移观测结果一致。这两个群体的组合产生的整体振幅的一个因素的~4低于观测到的发光的红色星系与一个陡峭的光度依赖性的路线。精确星系形状的限制意味着模拟中的星系数量只有在r波段绝对星等<-20时才是完整的。更高分辨率的模拟将是必要的，以避免外推的内在对齐预测的范围内的光度探测未来的调查。
Intrinsic galaxy shape and angular momentum alignments can arise in cosmological large-scale structure due to tidal interactions or galaxy formation processes. Cosmological hydrodynamical simulations have recently come of age as a tool to study these alignments and their contamination to weak gravitational lensing. We probe the redshift and luminosity evolution of intrinsic alignments in Horizon-AGN between z=0 and z=3 for galaxies with an r-band absolute magnitude of 1 Mpc. Alignments of discs are null in projection and consistent with current low redshift observations. The combination of the two populations yields an overall amplitude a factor of ~4 lower than observed alignments of luminous red galaxies with a steeper luminosity dependence. The restriction on accurate galaxy shapes implies that the galaxy population in the simulation is complete only to an r-band absolute magnitude of <-20. Higher resolution simulations will be necessary to avoid extrapolation of the intrinsic alignment predictions to the range of luminosities probed by future surveys.