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首页> 外文期刊>The Astrophysical journal >The Clustering Of Sdss Galaxy Groups: Mass And Color Dependence
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The Clustering Of Sdss Galaxy Groups: Mass And Color Dependence

机译：Sdss星系组的聚类：质量和颜色依赖性

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We use a large sample of galaxy groups selected from the SDSS data release 4 with an adaptive halo-based group finder to probe how the clustering strength of groups depends on their masses and colors. In particular, we determine the relative biases of groups of different masses, as well as that of groups with the same mass but with different colors. In agreement with previous studies, we find that more massive groups are more strongly clustered, and the inferred mass dependence of the halo bias is in good agreement with predictions for the ΛCDM concordance cosmology. Regarding the color dependence, we find that groups with red centrals are more strongly clustered than groups of the same mass but with blue centrals. Similar results are obtained when the color of a group is defined to be the total color of its member galaxies. The color dependence is more prominent in less massive groups and becomes insignificant in groups with masses approx> 10~(14) h~(-1) M_☉. These results are consistent with those obtained by Yang et al. from an analysis of the 2dFGRS, but inconsistent with those obtained by Berlind et al., who also used an SDSS group catalog. We construct a mock galaxy redshift survey from the large Millennium TV-body simulation. Applying our group finder to this mock survey, and analyzing the mock data in exactly the same way as the true data, we are able to accurately recover the intrinsic mass and color dependencies of the halo bias in the model. Interestingly, the semianalytical model reveals the same color dependence of the halo bias as we find in our group catalog. We discuss these results in light of the assembly bias of dark matter halos and the star formation histories of galaxies.
机译：我们使用从SDSS数据版本4中选出的大量星系组样本，以及基于自适应光环的组发现器，来探究各组的聚类强度如何取决于其质量和颜色。尤其是，我们确定质量不同的组以及质量相同但颜色不同的组的相对偏差。与先前的研究一致，我们发现更多的质量团更强地聚集，并且推断的晕圈偏差的质量依赖性与ΛCDM一致性宇宙学的预测非常吻合。关于颜色依赖性，我们发现具有红色中心的组比具有相同质量但具有蓝色中心的组更强地聚集。当一个组的颜色定义为其成员星系的总颜色时，可以获得类似的结果。颜色依赖性在质量较轻的组中更为突出，而在质量约为10〜（14）h〜（-1）M_☉的组中则不明显。这些结果与Yang等人的结果一致。来自2dFGRS的分析，但与Berlind等人（也使用SDSS组目录）获得的结果不一致。我们从大型千禧电视人体模拟中构建了一个模拟银河红移调查。将我们的分组查找器应用于此模拟调查，并以与真实数据完全相同的方式分析模拟数据，我们能够准确地恢复模型中光晕偏差的固有质量和颜色依赖性。有趣的是，半分析模型揭示了与我们在集团目录中发现的相同的光晕偏色依赖性。我们根据暗物质光环的装配偏差和星系的恒星形成历史来讨论这些结果。

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