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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The atacama cosmology telescope: Dynamical masses and scaling relations for A sample of massive Sunyaev-Zel'dovich effect selected galaxy clusters
Astrophysical Journal, Volume 772, No. 1, Article 25, Year 2013
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Description
We present the first dynamical mass estimates and scaling relations for a sample of Sunyaev-Zel'dovich effect (SZE) selected galaxy clusters. The sample consists of 16 massive clusters detected with the Atacama Cosmology Telescope (ACT) over a 455 deg2 area of the southern sky. Deep multi-object spectroscopic observations were taken to secure intermediate-resolution (R ∼ 700-800) spectra and redshifts for 60 member galaxies on average per cluster. The dynamical masses M 200c of the clusters have been calculated using simulation-based scaling relations between velocity dispersion and mass. The sample has a median redshift z = 0.50 and a median mass with a lower limit , consistent with the expectations for the ACT southern sky survey. These masses are compared to the ACT SZE properties of the sample, specifically, the match-filtered central SZE amplitude , the central Compton parameter y 0, and the integrated Compton signal Y 200c , which we use to derive SZE-mass scaling relations. All SZE estimators correlate with dynamical mass with low intrinsic scatter (≲ 20%), in agreement with numerical simulations. We explore the effects of various systematic effects on these scaling relations, including the correlation between observables and the influence of dynamically disturbed clusters. Using the three-dimensional information available, we divide the sample into relaxed and disturbed clusters and find that ∼50% of the clusters are disturbed. There are hints that disturbed systems might bias the scaling relations, but given the current sample sizes, these differences are not significant; further studies including more clusters are required to assess the impact of these clusters on the scaling relations. © 2013. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Sifón, Cristóbal
Chile, Santiago
Pontificia Universidad Católica de Chile
Netherlands, Leiden
Sterrewacht Leiden
Menanteau, Felipe
United States, New Brunswick
Rutgers University–new Brunswick
Hasselfield, Matthew F.
Canada, Vancouver
The University of British Columbia
Marriage, Tobias A.
United States, Baltimore
Johns Hopkins University
Hughes, John P.
United States, New Brunswick
Rutgers University–new Brunswick
Barrientos, F. Felipe
Chile, Santiago
Pontificia Universidad Católica de Chile
González, Jorge Nuevo
Chile, Santiago
Pontificia Universidad Católica de Chile
Infante, Leopoldo
Chile, Santiago
Pontificia Universidad Católica de Chile
Addison, Graeme E.
United Kingdom, Oxford
University of Oxford
Battaglia, Nicholas
Canada, Toronto
L’institut Canadien D’astrophysique Théorique
Bond, J. Richard
Canada, Toronto
L’institut Canadien D’astrophysique Théorique
Crichton, Devin T.
United States, Baltimore
Johns Hopkins University
Das, Sudeep
United States, Berkeley
University of California, Berkeley
Devlin, Mark J.
United States, Philadelphia
University of Pennsylvania
Dunkley, Joanna
United Kingdom, Oxford
University of Oxford
Dünner, Rolando
Chile, Santiago
Pontificia Universidad Católica de Chile
Gralla, Megan B.
United States, Baltimore
Johns Hopkins University
Hajian, Amir
Canada, Toronto
L’institut Canadien D’astrophysique Théorique
Hilton, Matt
United Kingdom, Nottingham
University of Nottingham
Hincks, Adam D.
Canada, Toronto
L’institut Canadien D’astrophysique Théorique
United States, Princeton
Princeton University
Kosowsky, Arthur B.
United States, Pittsburgh
University of Pittsburgh
Marsden, Danica W.
United States, Santa Barbara
University of California, Santa Barbara
Moodley, Kavilan
South Africa, Durban
University of Kwazulu-natal
Niemack, Michael D.
United States, Gaithersburg
National Institute of Standards and Technology
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
Sehgal, Neelima
United States, Princeton
Princeton University
Sievers, Jonathan L.
Canada, Toronto
L’institut Canadien D’astrophysique Théorique
Spergel, David N.
United States, Princeton
Princeton University
Staggs, Suzanne T.
United States, Princeton
Princeton University
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: 108
Authors: 35
Affiliations: 19
Identifiers
Doi:
10.1088/0004-637X/772/1/25
ISSN:
0004637X
e-ISSN:
15384357
Study Design
Cross Sectional Study
Study Approach
Quantitative