论文标题
内在一致性对增长率聚类约束的影响
Impact of intrinsic alignments on clustering constraints of the growth rate
论文作者
论文摘要
星系与大规模结构之间的固有比对污染了星系聚类分析和对星系偏差的影响约束，以及宇宙中结构的增长率。这是对与大规模结构相关的光谱样品产生选择效应的比对的结果。在这项工作中，我们量化了对星系偏差的偏见以及忽略对齐时的增长率。我们还通过考虑效果和不同探针组合的外部先验来检查不同的选择来缓解对齐的选择。我们发现，限制在$ k _ {\ rm max} = 0.1 $ mpc $^{ - 1} $的保守分析没有显着影响。但是，旨在进行较高波数的分析可以证明对齐对准有重大污染。在这些情况下，包括对齐幅度的先验，或将聚类与星系的位置间形相关性结合在一起，可以恢复相同的预期约束功率，甚至可以告知偏见和增长率测量值。
Intrinsic alignments between galaxies and the large-scale structure contaminate galaxy clustering analyses and impact constraints on galaxy bias and the growth rate of structure in the Universe. This is the result of alignments inducing a selection effect on spectroscopic samples which is correlated with the large-scale structure. In this work, we quantify the biases on galaxy bias and the growth rate when alignments are neglected. We also examine different options for the mitigation of alignments by considering external priors on the effect and different probe combinations. We find that conservative analyses that restrict to $k_{\rm max}=0.1$ Mpc$^{-1}$ are not significantly affected. However, analyses that aim to go to higher wave numbers could evidence a significant contamination from alignments. In those cases, including a prior on alignment amplitude, or combining clustering with the position-intrinsic shape correlation of galaxies, can recover the same expected constraining power, or even inform bias and growth rate measurements.
