在光学和近红外巡天中检验星系团发现、质量估算和光度红移估算的参数化星系表模拟器
A Parametrized Galaxy Catalog Simulator For Testing Cluster Finding, Mass Estimation and Photometric Redshift Estimation in Optical and Near Infrared Surveys
摘要：
我们提出了一个星系目录模拟器，把N体模拟与subhalos到多波段光度模拟。该模拟器分配星系的属性，每个subhalo重现观察到的星系团星系晕的职业分布，径向和质量依赖的变化，在蓝色星系的分数，在集群和领域的光度功能，和红色序列的集群。此外，这些参数的演变被调整，以匹配现有的观测约束。场星系的采样从现有的多波段光度调查使用派生星系光度红移。参数化集群星系属性的集合使我们能够创建模拟目录与这些属性的变化，这反过来又使我们能够量化集群发现这些属性的当前观测不确定性的敏感性。我们提出了一个应用程序的目录模拟器的特点选择功能的星系团发现，利用集群红序列星系集群的天空中，在完整性和污染。我们估计系统的不确定性，由于我们的模拟器参数的观测不确定性，在确定选择函数使用五个不同的修改目录。我们的估计表明，这些不确定性是在$\le15$ %的水平与目前的观测限制集群星系的人口和他们的演变。此外，我们检查的$B_{gc}$参数作为一个光学质量指标和测量的$B_{gc}$ -质量关系的内在散射近似对数正态与$σ_{\log_{10}M}\sim0.25$。最后，我们提出了一个红色的序列的超密度红移估计使用模拟和真实的数据进行测试，表明它提供了大量的集群红移与$\sim$ 2%的准确度出红移$z\sim0.5$与SDS类数据集。
英文摘要：
We present a galaxy catalog simulator which turns N-body simulations with subhalos into multiband photometric mocks. The simulator assigns galaxy properties to each subhalo to reproduce the observed cluster galaxy halo occupation distribution, the radial and mass dependent variation in fractions of blue galaxies, the luminosity functions in clusters and the field, and the red-sequence in clusters. Moreover, the evolution of these parameters is tuned to match existing observational constraints. Field galaxies are sampled from existing multiband photometric surveys using derived galaxy photometric redshifts. Parametrizing an ensemble of cluster galaxy properties enables us to create mock catalogs with variations in those properties, which in turn allows us to quantify the sensitivity of cluster finding to current observational uncertainties in these properties. We present an application of the catalog simulator to characterize the selection function of a galaxy cluster finder that utilizes the cluster red-sequence galaxy clustering on the sky, in terms of completeness and contamination. We estimate systematic uncertainties due to the observational uncertainties on our simulator parameters in determining the selection function using five different sets of modified catalogs. Our estimates indicate that these uncertainties are at the $\le15$% level with current observational constraints on cluster galaxy populations and their evolution. In addition, we examine the $B_{gc}$ parameter as an optical mass indicator and measure the intrinsic scatter of the $B_{gc}$--mass relation to be approximately log normal with $σ_{\log_{10}M}\sim0.25$. Finally, we present tests of a red sequence overdensity redshift estimator using both simulated and real data, showing that it delivers redshifts for massive clusters with $\sim$2% accuracy out to redshifts $z\sim0.5$ with SDSS-like datasets.
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