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The Atacama Cosmology Telescope

Title: The Atacama Cosmology Telescope: Dynamical Masses For 44 Sz-selected Galaxy Clusters Over 755 Square Degrees.
Name(s): Sifon, Cristobal, author
Battaglia, Nick, author
Hasselfield, Matthew, author
Menanteau, Felipe, author
Felipe Barrientos, L., author
Bond, J. Richard, author
Crichton, Devin, author
Devlin, Mark J., author
Dunner, Rolando, author
Hilton, Matt, author
Hincks, Adam D., author
Hlozek, Renee, author
Huffenberger, Kevin M., author
Hughes, John P., author
Infante, Leopoldo, author
Kosowsky, Arthur, author
Marsden, Danica, author
Marriage, Tobias A., author
Moodley, Kavilan, author
Niemack, Michael D., author
Page, Lyman A., author
Spergel, David N., author
Staggs, Suzanne T., author
Trac, Hy, author
Wollack, Edward J., author
Type of Resource: text
Genre: Text
Date Issued: 2016-09-01
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: We present galaxy velocity dispersions and dynamical mass estimates for 44 galaxy clusters selected via the Sunyaev-Zel'dovich (SZ) effect by the Atacama Cosmology Telescope. Dynamical masses for 18 clusters are reported here for the first time. Using N-body simulations, we model the different observing strategies used to measure the velocity dispersions and account for systematic effects resulting from these strategies. We find that the galaxy velocity distributions may be treated as isotropic, and that an aperture correction of up to 7 per cent in the velocity dispersion is required if the spectroscopic galaxy sample is sufficiently concentrated towards the cluster centre. Accounting for the radial profile of the velocity dispersion in simulations enables consistent dynamical mass estimates regardless of the observing strategy. Cluster masses M200 are in the range (1-15) x 10(14)M(circle dot). Comparing with masses estimated from the SZ distortion assuming a gas pressure profile derived from X-ray observations gives a mean SZ-to-dynamical mass ratio of 1.10 +/- 0.13, but there is an additional 0.14 systematic uncertainty due to the unknown velocity bias; the statistical uncertainty is dominated by the scatter in the mass-velocity dispersion scaling relation. This ratio is consistent with previous determinations at these mass scales.
Identifier: FSU_libsubv1_wos_000383272500022 (IID), 10.1093/mnras/stw1284 (DOI)
Keywords: act-cl j0102-4915, cosmology: observations, digital sky survey, galaxies: clusters: general, Galaxies: distances and redshifts, large-scale structure of Universe, rich clusters, scaling relations, south-pole telescope, sunyaev-zeldovich, velocity dispersions, weak-lensing masses, x-ray-properties, zeldovich-selected clusters
Publication Note: The publisher’s version of record is available at
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Owner Institution: FSU
Is Part Of: Monthly Notices of the Royal Astronomical Society.
Issue: iss. 1, vol. 461

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Sifon, C., Battaglia, N., Hasselfield, M., Menanteau, F., Felipe Barrientos, L., Bond, J. R., … Wollack, E. J. (2016). The Atacama Cosmology Telescope: Dynamical Masses For 44 Sz-selected Galaxy Clusters Over 755 Square Degrees. Monthly Notices Of The Royal Astronomical Society. Retrieved from