The Atacama Cosmology Telescope: The Two-Season ACTPol Sunyaev-Zel'dovich Effect Selected Cluster Catalog

• Published in: The Astrophysical Journal Supplement Series
• Main Authors: Hilton, Matt, Hasselfield, Matthew, Sifón, Cristóbal, Battaglia, Nicholas, Aiola, Simone, Bharadwaj, V., Richard Bond, J., Choi, Steve K., Crichton, Devin, Datta, Rahul, Devlin, Mark J., Dunkley, Joanna, Dünner, Rolando, Gallardo, Patricio A., Gralla, Megan, Hincks, Adam D., Ho, Shuay-Pwu P., Hubmayr, Johannes, Huffenberger, Kevin M., Hughes, John P., Koopman, Brian J., Kosowsky, Arthur, Louis, Thibaut, Madhavacheril, Mathew S., Marriage, Tobias A., Maurin, Loic, Mcmahon, Jeff, Miyatake, Hironao, Moodley, Kavilan, Næss, Sigurd, Nati, Federico, Niemack, Michael D., Oguri, Masamune, Page, Lyman A., Partridge, Bruce, Schmitt, Benjamin L., Sievers, Jon, Spergel, David N., Staggs, Suzanne T., Trac, Hy, van Engelen, Alexander, Vavagiakis, Eve M., Wollack, Edward J.
• Other Authors: Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), ACT
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2018
• Subjects: cosmology: large-scale structure of universe; cosmology: observations; galaxies: clusters: general; [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]; South pole
• Online Access: https://hal.science/hal-01737892; https://doi.org/10.3847/1538-4365/aaa6cb

International audience We present a catalog of 182 galaxy clusters detected through the Sunyaev–Zel’dovich (SZ) effect by the Atacama Cosmology Telescope in a contiguous 987.5 deg2 field. The clusters were detected as SZ decrements by applying a matched filter to 148 GHz maps that combine the original ACT equatorial survey with data from the first two observing seasons using the ACTPol receiver. Optical/IR confirmation and redshift measurements come from a combination of large public surveys and our own follow-up observations. Where necessary, we measured photometric redshifts for clusters using a pipeline that achieves accuracy Δz/(1 + z) = 0.015 when tested on Sloan Digital Sky Survey data. Under the assumption that clusters can be described by the so-called universal pressure profile (UPP) and its associated mass scaling law, the full signal-to-noise ratio > 4 sample spans the mass range , with median . The sample covers the redshift range 0.1 < z < 1.4 (median z = 0.49), and 28 clusters are new discoveries (median z = 0.80). We compare our catalog with other overlapping cluster samples selected using the SZ, optical, and X-ray wavelengths. We find that the ratio of the UPP-based SZ mass to richness-based weak-lensing mass is . After applying this calibration, the mass distribution for clusters with M 500c > 4 × 1014 M ⊙ is consistent with the number of such clusters found in the South Pole Telescope SZ survey.