Velocity Segregation and Systematic Biases in Velocity Dispersion Estimates with the SPT-GMOS Spectroscopic Survey

Velocity Segregation and Systematic Biases in Velocity Dispersion Estimates with the SPT-GMOS Spectroscopic Survey
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SPT-GMOS 光谱测量速度色散估计中的速度分离和系统偏差

DOI:
10.3847/1538-4357/aa607c
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发表时间:
2016
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
A. Zenteno
A. Zenteno
中科院分区:
--
文献类型:
--
作者:
M. Bayliss;Kyle Zengo;J. Ruel;B. Benson;L. Bleem;S. Bocquet;E. Bulbul;M. Brodwin;R. Capasso;I. Chiu;M. McDonald;D. Rapetti;A. Saro;B. Stalder;A. Stark;V. Strazzullo;C. Stubbs;A. Zenteno

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星系团中星系的速度分布并不具有普遍性;相反,星系是根据其光谱类型和相对光度进行隔离的。我们检查了 89 个 Sunyaev Zel'dovich (SZ) 选择的星系团内不同星系群的速度分布,该星系团跨越 。我们的样本主要取自 SPT-GMOS 光谱调查,并辅以其他已发表的光谱,最终得到 4148 个星系光谱(2868 个星团成员)的光谱样本。恒星形成星系团的速度色散比被动星系团的速度色散大 17 ± 4%,明亮 ( ) 星团星系的速度色散比我们总成员星系的速度色散低 11 ± 4%。我们发现,测量的速度色散与用于测量速度色散的被动星系与恒星形成星系的比例之间的关系形状与模拟非常一致,但我们发现数据和模拟中测量的这种关系之间有一个小偏移,这表明我们的色散相对于模拟而言系统性低多达 3%。我们认为,这种偏移可以解释为有效速度偏差的测量,它描述了我们观察到的速度色散与已发表的模拟结果中暗物质粒子的固有速度色散的比率。以这种方式测量速度偏差表明,即使面对速度偏差,大型光谱测量也可以通过量化并最终校准它们来改善宇宙学中基于色散的质量可观测标度关系。
The velocity distribution of galaxies in clusters is not universal; rather, galaxies are segregated according to their spectral type and relative luminosity. We examine the velocity distributions of different populations of galaxies within 89 Sunyaev Zel’dovich (SZ) selected galaxy clusters spanning . Our sample is primarily draw from the SPT-GMOS spectroscopic survey, supplemented by additional published spectroscopy, resulting in a final spectroscopic sample of 4148 galaxy spectra—2868 cluster members. The velocity dispersion of star-forming cluster galaxies is 17 ± 4% greater than that of passive cluster galaxies, and the velocity dispersion of bright ( ) cluster galaxies is 11 ± 4% lower than the velocity dispersion of our total member population. We find good agreement with simulations regarding the shape of the relationship between the measured velocity dispersion and the fraction of passive versus star-forming galaxies used to measure it, but we find a small offset between this relationship as measured in data and simulations, which suggests that our dispersions are systematically low by as much as 3% relative to simulations. We argue that this offset could be interpreted as a measurement of the effective velocity bias that describes the ratio of our observed velocity dispersions and the intrinsic velocity dispersion of dark matter particles in a published simulation result. Measuring velocity bias in this way suggests that large spectroscopic surveys can improve dispersion-based mass-observable scaling relations for cosmology even in the face of velocity biases, by quantifying and ultimately calibrating them out.
南极望远镜巡天第一个 178 度2 的 X 射线观测中 SUNYAEVâZELDovich 选定星团的宇宙学约束
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