The Atacama Cosmology Telescope: DR5 maps of 18,000 square degrees of the microwave sky from ACT 2008-2018 data
Creators: name: Naess, Sigurd
name: Aiola, Simone
name: Austermann, Jason E.
name: Battaglia, Nick
name: Beall, James A.
name: Becker, Daniel T.
name: Bond, Richard J.
name: Calabrese, Erminia
name: Choi, Steve K.
name: Cothard, Nicholas F.
name: Crowley, Kevin T.
name: Darwish, Omar
name: Datta, Rahul
name: Denison, Edward V.
name: Devlin, Mark
name: Duell, Cody J.
name: Duff, Shannon M.
name: Duivenvoorden, Adriaan J.
name: Dunkley, Jo
name: Dünner, Rolando
name: Fox, Anna E.
name: Gallardo, Patricio A.
name: Halpern, Mark
name: Han, Dongwon
name: Hasselfield, Matthew
name: Hill, J. Colin
name: Hilton, Gene C.
name: Hilton, Matt
name: Hincks, Adam D.
name: Hložek, Renée
name: Ho, Shuay-Pwu Patty
name: Hubmayr, Johannes
name: Huffenberger, Kevin
name: Hughes, John P.
name: Kosowsky, Arthur B.
name: Louis, Thibaut
name: Madhavacheril, Mathew S.
name: McMahon, Jeff
name: Moodley, Kavilan
name: Nati, Federico
name: Nibarger, John P.
name: Niemack, Michael D.
name: Page, Lyman
name: Partridge, Bruce
name: Salatino, Maria
name: Schaan, Emmanuel
name: Schillaci, Alessandro
name: Schmitt, Benjamin
name: Sherwin, Blake D.
name: Sehgal, Neelima
name: Sifón, Cristóbal
name: Spergel, David
name: Staggs, Suzanne
name: Stevens, Jason
name: Storer, Emilie
name: Ullom, Joel N.
name: Vale, Leila R.
name: Van Engelen, Alexander
name: Van Lanen, Jeff
name: Vavagiakis, Eve M.
name: Wollack, Edward J.
name: Xu, Zhilei
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: This paper presents a maximum-likelihood algorithm for combining sky maps with disparate sky coverage, angular resolution and spatially varying anisotropic noise into a single map of the sky. We use this to merge hundreds of individual maps covering the 2008-2018 ACT observing seasons, resulting in by far the deepest ACT maps released so far. We also combine the maps with the full Planck maps, resulting in maps that have the best features of both Planck and ACT: Planck's nearly white noise on intermediate and large angular scales and ACT's high-resolution and sensitivity on small angular scales. The maps cover over 18,000 square degrees, nearly half the full sky, at 100, 150 and 220 GHz. They reveal 4,000 optically-confirmed clusters through the Sunyaev Zel'dovich effect (SZ) and 18,500 point source candidates at $&gt; 5σ$, the largest single collection of SZ clusters and millimeter wave sources to date. The multi-frequency maps provide millimeter images of nearby galaxies and individual Milky Way nebulae, and even clear detections of several nearby stars. Other anticipated uses of these maps include, for example, thermal SZ and kinematic SZ cluster stacking, CMB cluster lensing and galactic dust science. The method itself has negligible bias. However, due to the preliminary nature of some of the component data sets, we caution that these maps should not be used for precision cosmological analysis. The maps are part of ACT DR5, and are available on LAMBDA at https://lambda.gsfc.nasa.gov/product/act/actpol_prod_table.cfm. There is also a web atlas at https://phy-act1.princeton.edu/public/snaess/actpol/dr5/atlas.
description: 38 pages, 29 figures, data release on lambda. Published in JCAP