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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
The Atacama Cosmology Telescope: Sunyaev-Zel'dovich selected galaxy clusters at 148 GHz from three seasons of data
Journal of Cosmology and Astroparticle Physics, Volume 2013, No. 7, Article 008, Year 2013
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Description
We present a catalog of 68 galaxy clusters, of which 19 are new discoveries, detected via the Sunyaev-Zel'dovich effect (SZ) at 148 GHz in the Atacama Cosmology Telescope (ACT) survey on the celestial equator. With this addition, the ACT collaboration has reported a total of 91 optically confirmed, SZ detected clusters. The 504 square degree survey region includes 270 square degrees of overlap with SDSS Stripe 82, permitting the confirmation of SZ cluster candidates in deep archival optical data. The subsample of 48 clusters within Stripe 82 is estimated to be 90% complete for M500c > 4.5 × 1014M⊙ and redshifts 0.15 < z < 0.8. While a full suite of matched filters is used to detect the clusters, the sample is studied further through a "Profile Based Amplitude Analysis" using a statistic derived from a single filter at a fixed θ500 = 5'9 angular scale. This new approach incorporates the cluster redshift along with prior information on the cluster pressure profile to fix the relationship between the cluster characteristic size (R500) and the integrated Compton parameter (Y500). We adopt a one-parameter family of "Universal Pressure Profiles" (UPP) with associated scaling laws, derived from X-ray measurements of nearby clusters, as a baseline model. Three additional models of cluster physics are used to investigate a range of scaling relations beyond the UPP prescription. Assuming a concordance cosmology, the UPP scalings are found to be nearly identical to an adiabatic model, while a model incorporating non-thermal pressure better matches dynamical mass measurements and masses from the South Pole Telescope. A high signal to noise ratio subsample of 15 ACT clusters with complete optical follow-up is used to obtain cosmological constraints. We demonstrate, using fixed scaling relations, how the constraints depend on the assumed gas model if only SZ measurements are used, and show that constraints from SZ data are limited by uncertainty in the scaling relation parameters rather than sample size or measurement uncertainty. We next add in seven clusters from the ACT Southern survey, including their dynamical mass measurements, which are based on galaxy velocity dispersions and thus are independent of the gas physics. In combination with WMAP7 these data simultaneously constrain the scaling relation and cosmological parameters, yielding 68% confidence ranges described by σ8 = 0.829 ± 0.024 and Ωm = 0.292 ± 0.025. We consider these results in the context of constraints from CMB and other cluster studies. The constraints arise mainly due to the inclusion of the dynamical mass information and do not require strong priors on the SZ scaling relation parameters. The results include marginalization over a 15% bias in dynamical masses relative to the true halo mass. In an extension to ACDM that incorporates non-zero neutrino mass density, we combine our data with WMAP7, Baryon Acoustic Oscillation data, and Hubble constant measurements to constrain the sum of the neutrino mass species to be Σv mv < 0.29 eV (95% confidence limit). © 2013 IOP Publishing Ltd and Sissa Medialab srl.
Authors & Co-Authors
Hasselfield, Matthew F.
United States, Princeton
Princeton University
Canada, Vancouver
The University of British Columbia
Hilton, Matt
South Africa, Durban
University of Kwazulu-natal
United Kingdom, Nottingham
University of Nottingham
Marriage, Tobias A.
United States, Baltimore
Johns Hopkins University
Addison, Graeme E.
Canada, Vancouver
The University of British Columbia
United Kingdom, Oxford
University of Oxford
Felipe Barrientos, L.
Chile, Santiago
Pontificia Universidad Católica de Chile
Battaglia, Nicholas
United States, Pittsburgh
Carnegie Mellon University
Canada, Toronto
L’institut Canadien D’astrophysique Théorique
Battistelli, Elia Stefano
Canada, Vancouver
The University of British Columbia
Italy, Rome
Sapienza Università Di Roma
Bond, J. Richard
Italy, Rome
Sapienza Università Di Roma
Crichton, Devin T.
United States, Baltimore
Johns Hopkins University
Das, Sudeep
United States, Lemont
Argonne National Laboratory
United States, Berkeley
Lawrence Berkeley National Laboratory
Devlin, Mark J.
United States, Philadelphia
University of Pennsylvania
Dicker, Simon R.
United States, Philadelphia
University of Pennsylvania
Dunkley, Joanna
United Kingdom, Oxford
University of Oxford
Dünner, Rolando
Chile, Santiago
Pontificia Universidad Católica de Chile
Fowler, Joseph W.
United States, Gaithersburg
National Institute of Standards and Technology
United States, Princeton
Princeton University
Gralla, Megan B.
United States, Baltimore
Johns Hopkins University
Hajian, Amir
Canada, Toronto
L’institut Canadien D’astrophysique Théorique
Halpern, Mark
Canada, Vancouver
The University of British Columbia
Hincks, Adam D.
Canada, Toronto
L’institut Canadien D’astrophysique Théorique
Hložek, Renée A.
United States, Princeton
Princeton University
Hughes, John P.
United States, New Brunswick
Rutgers University–new Brunswick
Infante, Leopoldo
Chile, Santiago
Pontificia Universidad Católica de Chile
Irwin, Kent D.
United States, Gaithersburg
National Institute of Standards and Technology
Kosowsky, Arthur B.
United States, Pittsburgh
University of Pittsburgh
Marsden, Danica W.
United States, Philadelphia
University of Pennsylvania
United States, Santa Barbara
University of California, Santa Barbara
Menanteau, Felipe
United States, New Brunswick
Rutgers University–new Brunswick
Moodley, Kavilan
South Africa, Durban
University of Kwazulu-natal
Niemack, Michael D.
United States, Gaithersburg
National Institute of Standards and Technology
United States, Princeton
Princeton University
United States, Ithaca
Cornell University
Nolta, Michael R.
Canada, Toronto
L’institut Canadien D’astrophysique Théorique
Page, Lyman A.
United States, Princeton
Princeton University
Partridge, Bruce
United States, Haverford
Haverford College
Reese, Erik D.
United States, Philadelphia
University of Pennsylvania
Schmitt, Benjamin L.
United States, Philadelphia
University of Pennsylvania
Sehgal, Neelima
United States, Stony Brook
Stony Brook University
Sherwin, Blake D.
United States, Princeton
Princeton University
Sievers, Jonathan L.
United States, Princeton
Princeton University
Canada, Toronto
L’institut Canadien D’astrophysique Théorique
Sifón, Cristóbal
Netherlands, Leiden
Sterrewacht Leiden
Spergel, David N.
United States, Princeton
Princeton University
Staggs, Suzanne T.
United States, Princeton
Princeton University
Swetz, Daniel S.
United States, Philadelphia
University of Pennsylvania
United States, Gaithersburg
National Institute of Standards and Technology
Switzer, Eric R.
Canada, Toronto
L’institut Canadien D’astrophysique Théorique
Thornton, Robert J.
United States, Philadelphia
University of Pennsylvania
United States, West Chester
West Chester University
Trac, H. Y.
United States, Pittsburgh
Carnegie Mellon University
Wollack, Edward J.
United States, Greenbelt
Nasa Goddard Space Flight Center
Statistics
Citations: 374
Authors: 44
Affiliations: 23
Identifiers
Doi:
10.1088/1475-7516/2013/07/008
e-ISSN:
14757516
Study Design
Cross Sectional Study
Cohort Study
Study Approach
Quantitative