Cross-correlating radio continuum surveys and CMB lensing: constraining redshift distributions, galaxy bias, and cosmology
Cross-correlating radio continuum surveys and CMB lensing: constraining redshift distributions, galaxy bias, and cosmology
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射电连续谱巡天和 CMB 透镜的互相关：约束红移分布、星系偏差和宇宙学
DOI：
10.1093/mnras/stab046
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发表时间：
2021
影响因子：
4.8
通讯作者：
Alonso D
中科院分区：
文献类型：
--
作者：
Alonso D
我们测量了LOFAR两米巡天(LOTSS)首次发布的数据中星系超密度的谐波空间自功率谱及其与Planck合作的宇宙微波背景(CMB)透镜会聚图的相互关联。我们报告了一个∼5σ检测到的互相关。我们发现，结合聚集功率谱和CMB透镜互相关，我们可以对红移分布的高红移尾部施加限制，红移分布是宇宙学连续测量中最大的不确定性来源之一。我们的分析表明，正如预期的那样，我们倾向于选择比LoTSS增值星表中包含的光度学红移所预测的更宽的红移尾巴，并且更符合模拟和光谱数据的预测。虽然CMB透镜限制红移分布的宽度和尾部的能力对于当前和未来的光度弱透镜观测的分析也是有价值的，但我们表明它的性能强烈地依赖于星系偏差的红移演化。假设平方千米阵列设计模拟预测的红移分布，我们使用我们的测量对射电星系的线性偏差和物质不均匀的幅度σ8施加约束，发现假设星系偏差与线性增长因子的倒数成反比，并假设偏差为常数。
We measure the harmonic-space auto-power spectrum of the galaxy overdensity in the LOFAR Two-metre Sky Survey (LoTSS) first data release and its cross-correlation with the map of the lensing convergence of the cosmic microwave background (CMB) from thePlanckcollaboration. We report a ∼5σ detection of the cross-correlation. We show that the combination of the clustering power spectrum and CMB lensing cross-correlation allows us to place constraints on the high-redshift tail of the redshift distribution, one of the largest sources of uncertainty in the use of continuum surveys for cosmology. Our analysis shows a preference for a broader redshift tail than that predicted by the photometric redshifts contained in the LoTSS value-added catalogue, as expected, and more compatible with predictions from simulations and spectroscopic data. Although the ability of CMB lensing to constrain the width and tail of the redshift distribution could also be valuable for the analysis of current and future photometric weak lensing surveys, we show that its performance relies strongly on the redshift evolution of the galaxy bias. Assuming the redshift distribution predicted by the Square Kilometre Array Design simulations, we use our measurements to place constraints on the linear bias of radio galaxies and the amplitude of matter inhomogeneities σ8, findingassuming the galaxy bias scales with the inverse of the linear growth factor, andassuming a constant bias.
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影响因子：
4.8
作者：
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DOI：
10.1046/j.1365-8711.2003.06605.x
发表时间：
2003-03
影响因子：
4.8
作者：
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DOI：
10.3847/0067-0049/226/2/24
发表时间：
2015
期刊：
The Astrophysical Journal Supplement Series
影响因子：
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DOI：
10.1093/mnras/stz3581
发表时间：
2019
期刊：
arXiv: Cosmology and Nongalactic Astrophysics
影响因子：
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作者：
Zahra Gomes;S. Camera;M. Jarvis;C. Hale;J. Fonseca
通讯作者：
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