STACKING CAUSTIC MASSES FROM GALAXY CLUSTERS
STACKING CAUSTIC MASSES FROM GALAXY CLUSTERS
复制标题
堆积来自星系团的腐蚀性物质
DOI：
10.3847/1538-4357/834/2/204
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
C. Miller
中科院分区：
文献类型：
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作者：
D. Gifford;N. Kern;C. Miller
正在进行的和未来的光谱调查将测量数以万计的星系团内的许多星系红移。然而，这些集群内的抽样将是低的，每个集群。有了这样的数据，将很难实现准确和精确的质量估计个别集群使用相空间质量估计技术。我们开发和测试一个新的堆叠算法的基础上的焦散技术，减少了质量分散的合奏集群从70%的单个集群到不到10%的合奏集群只有15个星系每个集群和100个集群每个合奏。每个系综相空间的星系，逃逸速度的边缘变得容易识别和interloping星系的存在被最小化。我们开发和测试的算法来跟踪投影相空间表面直接，这导致最小偏差的动态质量估计。然后，我们量化如何装箱和采样影响相空间为基础的质量估计时，使用一个观测代理，结合现实的质量分散，如丰富度，并发现在装箱过程中增加的不确定性产生的偏差和分散的叠加质量估计的影响最小。
Ongoing and future spectroscopic surveys will measure numerous galaxy redshifts within tens of thousands of galaxy clusters. However, the sampling within these clusters will be low, per cluster. With such data, it will be difficult to achieve accurate and precise mass estimates for individual clusters using phase-space mass estimation techniques. We develop and test a new stacking algorithm based on the caustic technique, which reduces the mass scatter in for ensemble clusters from 70% for individual clusters to less than 10% for ensemble clusters with only 15 galaxies per cluster and 100 clusters per ensemble. With galaxies per ensemble phase space, the escape-velocity edge becomes readily identifiable and the presence of interloping galaxies is minimized. We develop and test an algorithm to trace the projected phase-space surface directly, which results in minimally biased dynamical mass estimates. We then quantify how binning and sampling affect the phase-space-based mass estimates when using an observational proxy that incorporates realistic mass scatter, like richness, and find the added uncertainty in the binning procedure has minimal influence on the resulting bias and scatter of the stacked mass estimates.