The evolution of the galaxy content of dark matter haloes
The evolution of the galaxy content of dark matter haloes
复制标题
DOI：
10.1093/mnras/stw2826
复制
发表时间：
2016-07
影响因子：
4.8
通讯作者：
S. Contreras;I. Zehavi;C. Baugh;N. Padilla;P. Norberg
中科院分区：
文献类型：
--
作者：
S. Contreras;I. Zehavi;C. Baugh;N. Padilla;P. Norberg
我们使用光晕占据分布（HOD）框架来描述两个独立星系形成模型对暗物质晕的星系含量及其随红移的演化的预测。我们的星系样本对应于由恒星质量定义的固定数量密度范围，跨度0≤z≤3。我们发现模型预测之间有惊人的相似之处。差异出现在低星系数密度，这对活动星系核加热热晕的处理很敏感。HOD形式的演化可以用一种相对简单的方式来描述，我们使用其在z = 0时的值和一个附加的演化参数来建模每个HOD参数。特别是，我们发现中心星系和卫星星系的特征晕质量之比可以作为星系演化模型的敏感诊断。我们的结果可以用来测试和发展星系演化的实证研究，并可以为未来的调查提供模拟星系目录的构建。
We use the halo occupation distribution (HOD) framework to characterize the predictions from two independent galaxy formation models for the galactic content of dark matter haloes and its evolution with redshift. Our galaxy samples correspond to a range of fixed number densities defined by stellar mass and span 0 ≤ z ≤ 3. We find remarkable similarities between the model predictions. Differences arise at low galaxy number densities which are sensitive to the treatment of heating of the hot halo by active galactic nuclei. The evolution of the form of the HOD can be described in a relatively simple way, and we model each HOD parameter using its value at z = 0 and an additional evolutionary parameter. In particular, we find that the ratio between the characteristic halo masses for hosting central and satellite galaxies can serve as a sensitive diagnostic for galaxy evolution models. Our results can be used to test and develop empirical studies of galaxy evolution, and can facilitate the construction of mock galaxy catalogues for future surveys.