ELUCID. V. Lighting Dark Matter Halos with Galaxies

ELUCID. V. Lighting Dark Matter Halos with Galaxies
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清晰。

DOI:
10.3847/1538-4357/aac2ce
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发表时间:
2017-12
影响因子:
4.9
通讯作者:
Yang Lei
Yang Lei
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Yang Xiaohu;Zhang Youcai;Wang Huiyuan;Liu Chengze;Lu Tianhuan;Li Shijie;Shi Feng;Jing Y P;Mo H J;van den Bosch Frank C;Kang Xi;Cui Weiguang;Guo Hong;Li Guoliang;Lim S H;Lu Yi;Luo Wentao;Wei Chengliang;Yang Lei

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在最近的一项研究中,我们利用封闭在500盒中的SDSS DR 7区域的北银河系极的星系分布进行了ELUCID模拟(ELUCID III)。在这里,我们使用一种新的邻域丰度匹配方法,在SDSS观测的星系模拟中,在重建的区域中照亮暗物质晕和暗物质晕。在我们利用ELUCID模拟中建立的星系-次晕联系来评估星系形成模型之前,我们先来探索这种联系的可靠性。为此,我们重点研究星系的以下几个方面:(1)星系的中心-次晕光度和质量关系,(2)星系的卫星部分,(3)星系的条件光度函数(CLF)和条件恒星质量函数(CSMF),(4)星系与暗物质粒子之间的互相关函数,其中大部分是分别测量的。和蓝色星系的人口。我们发现,我们的邻域丰度匹配方法准确地再现了中心的subhalo关系,卫星分数,CLFs,CSMF,和星系的偏差。这些特征确保了这样建立的星系-次晕连接在限制星系形成过程中将是非常有用的。我们提供了一些建议的三个层次上使用的星系subhalo对星系形成的约束。从我们的ELUCID模拟中提取的SDSS DR 7区域的星系-晕下链接和晕下合并树可根据要求提供。
In a recent study, using the distribution of galaxies in the north galactic pole of the SDSS DR7 region enclosed in a 500 box, we carried out our ELUCID simulation (ELUCID III). Here, we light the dark matter halos and subhalos in the reconstructed region in the simulation with galaxies in the SDSS observations using a novel neighborhood abundance matching method. Before we make use of the galaxy–subhalo connections established in the ELUCID simulation to evaluate galaxy formation models, we set out to explore the reliability of such a link. For this purpose, we focus on the following few aspects of galaxies: (1) the central–subhalo luminosity and mass relations, (2) the satellite fraction of galaxies, (3) the conditional luminosity function (CLF) and conditional stellar mass function (CSMF) of galaxies, and (4) the cross-correlation functions between galaxies and dark matter particles, most of which are measured separately for all, red, and blue galaxy populations. We find that our neighborhood abundance matching method accurately reproduces the central–subhalo relations, satellite fraction, and the CLFs, CSMFs, and biases of galaxies. These features ensure that galaxy–subhalo connections thus established will be very useful in constraining galaxy formation processes. We provide some suggestions for the three levels of using the galaxy–subhalo pairs for galaxy formation constraints. The galaxy–subhalo links and the subhalo merger trees in the SDSS DR7 region extracted from our ELUCID simulation are available upon request.
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