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arXiv 1503.03973astro-ph.GAastro-ph.CO
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基于红移空间聚类的次晕丰度匹配检验

Testing subhalo abundance matching from redshift-space clustering

Mikito Yamamoto, Shogo Masaki, Chiaki Hikage

摘要:

我们首次应用暗晕丰度匹配(SHAM)方法描述了包含非线性红移空间畸变的星系红移空间成团,上帝之指我们发现,标准的SHAM连接的星系的光度的最大圆速度的subhalos很好地再现了红移空间星系团在斯隆数字巡天在很宽的范围内从0.3到40 Mpc/h的光度依赖。结果表明,SHAM方法是非常有前途的红移空间星系成团的理论模型,没有额外的参数。我们还使用两种不同的颜色代理来测试颜色丰度匹配:根据Masaki等人(2013 b)的方法,晕下年龄和局部暗物质密度。观测到的红色星系团比蓝色星系团具有更强的上帝手指效应。我们发现暗晕年龄模型比局部暗物质密度模型更好地描述了观测到的颜色相关的红移空间聚类。结果表明,暗晕的年龄是决定星系颜色的关键因素。

英文摘要:

We present a first application of the subhalo abundance matching (SHAM) method to describe the redshift-space clustering of galaxies including the non-linear redshift-space distortion, i.e., the Fingers-of-God. We find that the standard SHAM connecting the luminosity of galaxies to the maximum circular velocity of subhalos well reproduces the luminosity dependence of redshift-space clustering of galaxies in the Sloan Digital Sky Survey in a wide range of scales from 0.3 to 40 Mpc/h. The result indicates that the SHAM approach is very promising for establishing a theoretical model of redshift-space galaxy clustering without additional parameters. We also test color abundance matching using two different proxies for colors: subhalo age and local dark matter density following the method by Masaki et al. (2013b). Observed clustering of red galaxies exhibits much stronger Fingers-of-God effect than blue galaxies. We find that the subhalo age model describes the observed color-dependent redshift-space clustering much better than the local dark matter density model. The result infers that the age of subhalos is a key ingredient to determine the color of galaxies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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