2019/09/30 by Alex Krolewski, Simone Ferraro, Edward F. Schlafly +1
Physics and Astronomy · #Cosmic microwave background #Cosmology and Gravitation Theories #Dark energy #Galaxies: Formation, Evolution, Phenomena #Galaxy #Gamma-ray bursts and supernovae #Observational cosmology #Photometric redshift #Planck #Quasar #Redshift #Weak gravitational lensing #astro-ph.CO
paper · pdf · doi:10.1088/1475-7516/2020/05/047
51 pages, 22 figures. Comments welcome! Revisions reflect version accepted by JCAP
openalex created_date 2019/09/26 · openalex publication_date 2020/05/26 · arxiv created 2021/05/21 · arxiv updated 2021/05/25 · openalex updated_date 2026/08/05
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 ∼ 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 < ℓ < 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.