The Atacama Cosmology Telescope: Component-separated maps of CMB temperature and the thermal Sunyaev-Zel'dovich effect
Creators: name: Madhavacheril, Mathew S.
name: Hill, J. Colin
name: Naess, Sigurd
name: Addison, Graeme E.
name: Aiola, Simone
name: Baildon, Taylor
name: Battaglia, Nicholas
name: Bean, Rachel
name: Bond, J. Richard
name: Calabrese, Erminia
name: Calafut, Victoria
name: Choi, Steve K.
name: Darwish, Omar
name: Devlin, Mark J.
name: Dunkley, Joanna
name: Dünner, Rolando
name: Ferraro, Simone
name: Gallardo, Patricio A.
name: Halpern, Mark
name: Han, Dongwon
name: Hasselfield, Matthew
name: Hilton, Matt
name: Hincks, Adam D.
name: Hložek, Renée
name: Ho, Shuay-Pwu Patty
name: Huffenberger, Kevin M.
name: Hughes, John P.
name: Koopman, Brian J.
name: Kosowsky, Arthur
name: Lokken, Martine
name: Louis, Thibaut
name: Lungu, Marius
name: MacInnis, Amanda
name: Maurin, Loïc
name: McMahon, Jeffrey J.
name: Moodley, Kavilan
name: Nati, Federico
name: Niemack, Michael D.
name: Page, Lyman A.
name: Partridge, Bruce
name: Robertson, Naomi
name: Sehgal, Neelima
name: Schaan, Emmanuel
name: Schillaci, Alessandro
name: Sherwin, Blake D.
name: Sifón, Cristóbal
name: Simon, Sara M.
name: Spergel, David N.
name: Staggs, Suzanne T.
name: Storer, Emilie R.
name: van Engelen, Alexander
name: Vavagiakis, Eve M.
name: Wollack, Edward J.
name: Xu, Zhilei
Publisher: name: arXiv
Year: 2019
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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 multi-frequency data from the Planck satellite and the Atacama Cosmology Telescope Polarimeter (ACTPol) to construct the first wide-area, arcminute-resolution component-separated maps (covering approximately 2100 sq. deg.) 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.
description: 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