arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1909.07412astro-ph.CO
收藏

普朗克CMB透镜的unWISE层析成像

unWISE tomography of Planck CMB lensing

Alex Krolewski, Simone Ferraro, Edward F. Schlafly, Martin White

摘要:

CMB透镜层析成像,或CMB透镜图和大尺度结构示踪剂之间的交叉相关性在一个明确的红移范围内,有可能映射宇宙时间的振幅和结构的增长,提供一些最严格的引力测试,并打破宇宙学参数之间的重要简并。在这项工作中,我们使用unWISE星系目录提供三个样本的中位数红移$z \sim 0.6, 1.1$和1.5,完全跨越了暗能量占主导地位的时代,连同最新的普朗克CMB透镜地图。我们得到一个组合的互相关意义$S/N = 79.3$的范围内的尺度$100 < \ell < 1000$。我们通过与COSMOS测光表的交叉匹配和与BOSS星系、类星体和eBOSS类星体的交叉相关来测量unWISE源的红移分布。我们还表明,放大偏倚必须包括在我们的分析,并执行一些零测试。在另一篇文章中,我们将通过模拟非线性和传播红移分布的不确定性来探索导出的宇宙学参数。

英文摘要:

CMB lensing tomography, or the cross-correlation between CMB lensing maps and large-scale structure tracers over a well-defined redshift range, has the potential to map the amplitude and growth of structure over cosmic time, provide some of the most stringent tests of gravity, and break important degeneracies between cosmological parameters. In this work, we use the unWISE galaxy catalog to provide three samples at median redshifts $z \sim 0.6, 1.1$ and 1.5, fully spanning the Dark Energy dominated era, together with the most recent Planck CMB lensing maps. We obtain a combined cross-correlation significance $S/N = 79.3$ over the range of scales $100 < \ell < 1000$. We measure the redshift distribution of unWISE sources by a combination of cross-matching with the COSMOS photometric catalog and cross-correlation with BOSS galaxies and quasars and eBOSS quasars. We also show that magnification bias must be included in our analysis and perform a number of null tests. In a companion paper, we explore the derived cosmological parameters by modeling the non-linearities and propagating the redshift distribution uncertainties.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑