Journal
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
Volume 191, Issue 2, Pages 423-438Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0067-0049/191/2/423
Keywords
cosmic background radiation; cosmology: observations; galaxies: clusters: general; methods: data analysis
Categories
Funding
- National Aeronautics and Space Administration
- U.S. National Science Foundation [AST-0408698, PHY-0355328, AST-0707731, PIRE-0507768]
- Princeton University
- University of Pennsylvania
- Natural Science and Engineering Research Council of Canada (NSERC)
- NSF [AST-0546035, AST-0606975, AST 0707731]
- FONDAP Centro de Astrofisica
- NSF Physics Frontier Center [PHY-0114422]
- South African National Research Foundation (NRF)
- Meraka Institute
- Rhodes Trust
- FONDECYT [3085031]
- [FP7-PEOPLE-2007-4-3 IRG]
- [202182]
- STFC [ST/G002711/1] Funding Source: UKRI
- ICREA Funding Source: Custom
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The Atacama Cosmology Telescope (ACT) is currently observing the cosmic microwave background with arcminute resolution at 148 GHz, 218 GHz, and 277 GHz. In this paper, we present ACT's first results. Data have been analyzed using a maximum-likelihood map-making method which uses B-splines to model and remove the atmospheric signal. It has been used to make high-precision beam maps from which we determine the experiment's window functions. This beam information directly impacts all subsequent analyses of the data. We also used the method to map a sample of galaxy clusters via the Sunyaev-Zel'dovich (SZ) effect and show five clusters previously detected with X-ray or SZ observations. We provide integrated Compton-y measurements for each cluster. Of particular interest is our detection of the z = 0.44 component of A3128 and our current non-detection of the low-redshift part, providing strong evidence that the further cluster is more massive as suggested by X-ray measurements. This is a compelling example of the redshift-independent mass selection of the SZ effect.
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