Will kinematic Sunyaev-Zel'dovich measurements enhance the science return from galaxy redshift surveys?
Will kinematic Sunyaev-Zel'dovich measurements enhance the science return from galaxy redshift surveys?
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DOI：
10.1088/1475-7516/2017/01/057
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发表时间：
2016-06
影响因子：
6.4
通讯作者：
Naonori S. Sugiyama;T. Okumura;D. Spergel
中科院分区：
文献类型：
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作者：
Naonori S. Sugiyama;T. Okumura;D. Spergel
是。未来的CMB实验，如Advanced ACTPol和CMB-S4，应该可以在红移测量中实现对典型星系宿主晕的S/N=0.1的测量。这些测量将提供大尺度结构的增长率f和宇宙H的膨胀速率到星系团的测量的补充测量。本文强调，相对成对kSZ测量的各向异性中有重要的信息。我们在勒让德多项式中扩展了相对成对kSZ功率谱，并考虑到它的八极点。假设滤波图中的噪声在观测星系的位置之间不相关，我们推导出红移空间中相对成对kSZ温度的功率谱协方差的简单解析形式。虽然以前的许多研究都乐观地假设观测中星系τT的光学厚度是已知的，但我们将τT边缘化，以计算对增长率f和膨胀率H的约束。对于实际的观测参数，我们发现结合KSZ和星系红移观测数据将H和f上的边际1-σ误差减少到~50-70%，而不是只分析星系。
Yes. Future CMB experiments such as Advanced ACTPol and CMB-S4 should achieve measurements with S/N of > 0.1 for the typical host halo of galaxies in redshift surveys. These measurements will provide complementary measurements of the growth rate of large scale structure f and the expansion rate of the Universe H to galaxy clustering measurements. This paper emphasizes that there is significant information in the anisotropy of the relative pairwise kSZ measurements. We expand the relative pairwise kSZ power spectrum in Legendre polynomials and consider up to its octopole. Assuming that the noise in the filtered maps is uncorrelated between the positions of galaxies in the survey, we derive a simple analytic form for the power spectrum covariance of the relative pairwise kSZ temperature in redshift space. While many previous studies have assumed optimistically that the optical depth of the galaxies τT in the survey is known, we marginalize over τT, to compute constraints on the growth rate f and the expansion rate H. For realistic survey parameters, we find that combining kSZ and galaxy redshift survey data reduces the marginalized 1-σ errors on H and f to ~50-70% compared to the galaxy-only analysis.