2019/11/30 by Mathew S. Madhavacheril, J. Colin Hill, Sigurd Næss +59 · 101 citations
Physics and Astronomy · #Astronomy #Astrophysics #Bolometer #Component (thermodynamics) #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Dark energy #Detector #Galaxies: Formation, Evolution, Phenomena #Meteorology #Observational cosmology #Optics #Physics #Solar and Space Plasma Dynamics #Sunyaev–Zel'dovich effect #Telescope #Thermal #astro-ph.CO #astro-ph.GA
paper · pdf · doi:10.1103/physrevd.102.023534
published in Physical review. D/Physical review. D. 102(2) (American Physical Society) · 24 pages, 11 figures, matches version accepted by PRD. Data products are available on LAMBDA at https://lambda.gsfc.nasa.gov/product/act/act_dr4_derived_maps_get.cfm
openalex publication_date 2020/07/22 · arxiv created 2020/07/28 · arxiv updated 2020/07/29 · openalex created_date 2020/07/29 · openalex updated_date 2026/08/06
Optimal analyses of many signals in the cosmic microwave background (CMB) require map-level extraction of individual components in the microwave sky, rather than measurements at the power spectrum level alone. To date, nearly all map-level component separation in CMB analyses has been performed exclusively using satellite data. In this paper, we implement a component separation method based on the internal linear combination (ILC) approach which we have designed to optimally account for the anisotropic noise (in the 2D Fourier domain) often found in ground-based CMB experiments. Using this method, we combine multifrequency data from the Planck satellite and the Atacama Cosmology Telescope Polarimeter (ACTPol) to construct the first wide-area (\ensuremath≈2100 sq. deg.), arcminute-resolution component-separated maps of the CMB temperature anisotropy and the thermal Sunyaev-Zel'dovich (tSZ) effect sourced by the inverse-Compton scattering of CMB photons off hot, ionized gas. Our ILC pipeline allows for explicit deprojection of various contaminating signals, including a modified blackbody approximation of the cosmic infrared background (CIB) spectral energy distribution. The cleaned CMB maps will be a useful resource for CMB lensing reconstruction, kinematic SZ cross-correlations, and primordial non-Gaussianity studies. The tSZ maps will be used to study the pressure profiles of galaxies, groups, and clusters through cross-correlations with halo catalogs, with dust contamination controlled via CIB deprojection. The data products described in this paper are available on LAMBDA.