THE ATACAMA COSMOLOGY TELESCOPE: SUNYAEV-ZEL'DOVICH-SELECTED GALAXY CLUSTERS AT 148 GHz IN THE 2008 SURVEY

Journal Article · Sat Aug 20 04:00:00 EDT 2011 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/737/2/61· OSTI ID:21579943

Marriage, Tobias A; Acquaviva, Viviana; Das, Sudeep; Dunkley, Joanna ^[1]; Ade, Peter A. R. ^[2]; Aguirre, Paula; Barrientos, L Felipe; Duenner, Rolando ^[3]; Amiri, Mandana; Battistelli, Elia S; Burger, Bryce ^[4]; Appel, John William; Essinger-Hileman, Thomas; Fisher, Ryan P ^[5]; Bond, J Richard ^[6]; Brown, Ben ^[7]; Chervenak, Jay ^[8]; Devlin, Mark J; Dicker, Simon R ^[9]; Doriese, W Bertrand ^[10]

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1. Department of Astrophysical Sciences, Peyton Hall, Princeton University, Princeton, NJ 08544 (United States)
2. School of Physics and Astronomy, Cardiff University, The Parade, Cardiff, Wales CF24 3AA (United Kingdom)
3. Departamento de Astronomia y Astrofisica, Facultad de Fisica, PontificIa Universidad Catolica, Casilla 306, Santiago 22 (Chile)
4. Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z4 (Canada)
5. Joseph Henry Laboratories of Physics, Jadwin Hall, Princeton University, Princeton, NJ 08544 (United States)
6. Canadian Institute for Theoretical Astrophysics, University of Toronto, Toronto, ON M5S 3H8 (Canada)
7. Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260 (United States)
8. Code 553/665, NASA/Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
9. Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104 (United States)
10. NIST Quantum Devices Group, Boulder, CO 80305 (United States)

We report on 23 clusters detected blindly as Sunyaev-ZEL'DOVICH (SZ) decrements in a 148 GHz, 455 deg{sup 2} map of the southern sky made with data from the Atacama Cosmology Telescope 2008 observing season. All SZ detections announced in this work have confirmed optical counterparts. Ten of the clusters are new discoveries. One newly discovered cluster, ACT-CL J0102-4915, with a redshift of 0.75 (photometric), has an SZ decrement comparable to the most massive systems at lower redshifts. Simulations of the cluster recovery method reproduce the sample purity measured by optical follow-up. In particular, for clusters detected with a signal-to-noise ratio greater than six, simulations are consistent with optical follow-up that demonstrated this subsample is 100% pure. The simulations further imply that the total sample is 80% complete for clusters with mass in excess of 6 x 10{sup 14} solar masses referenced to the cluster volume characterized by 500 times the critical density. The Compton y-X-ray luminosity mass comparison for the 11 best-detected clusters visually agrees with both self-similar and non-adiabatic, simulation-derived scaling laws.

• OSTI ID: 21579943
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 737; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
BACKGROUND RADIATION
GALAXY CLUSTERS
RADIATIONS
RED SHIFT
SIMULATION