@article{904f75d073ad484ebf1c7a9e1d897462,
title = "The Atacama Cosmology Telescope: Dynamical masses for 44 SZ-selected galaxy clusters over 755 square degrees",
abstract = "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) × 1014M⊙. 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.",
author = "Crist{\'o}bal Sif{\'o}n and Nick Battaglia and Matthew Hasselfield and Felipe Menanteau and {Felipe Barrientos}, L. and {Richard Bond}, J. and Devin Crichton and Devlin, {Mark J.} and Rolando D{\"u}nner and Matt Hilton and Hincks, {Adam D.} and Ren{\'e}e Hlozek and Huffenberger, {Kevin M.} and Hughes, {John P.} and Leopoldo Infante and Arthur Kosowsky and Danica Marsden and Marriage, {Tobias A.} and Kavilan Moodley and Niemack, {Michael D.} and Page, {Lyman A.} and Spergel, {David N.} and Staggs, {Suzanne T.} and Hy Trac and Wollack, {Edward J.}",
note = "Funding Information: ACKNOWLEDGEMENTS We thank Jarle Brinchmann for help interpreting the spectrum of the BCG of ACT-CL J0326.8-0043, Gary Mamon for useful discussions on cluster velocity dispersion profiles and Stefano Andreon and Bruce Partridge for useful comments during the preparation of this manuscript. We are grateful to the referee, August Evrard, for a thorough review of our work, which helped improve the clarity and robustness of the discussions presented in this paper. CS acknowledges support from the European Research Council under FP7 grant number 279396 awarded to H. Hoekstra. NB and RH acknowledge support from the iii Fellowship. LFB's research is supported by FONDECYT under project 1120676. AK acknowledges support from NSF grant 1312380. This work was supported by the US National Science Foundation through awards AST-0408698 and AST-0965625 for the ACT project, as well as awards PHY-0855887 and PHY-1214379. Funding was also provided by Princeton University, the University of Pennsylvania, and a Canada Foundation for Innovation (CFI) award to UBC. ACT operates in the Parque Astron{\'o}mico Atacama in northern Chile under the auspices of the Comisi{\'o}n Nacional de Investigaci{\'o}n Cient{\'i}fica y Tecnol{\'o}gica de Chile (CONICYT). Computations were performed on the GPC supercomputer at the SciNet HPC Consortium. SciNet is funded by the CFI under the auspices of Compute Canada, the Government of Ontario, the Ontario Research Fund -Research Excellence; and the University of Toronto. Based in part on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Minist{\'e}rio da Ci{\^e}ncia e Tecnologia (Brazil) and Ministerio de Ciencia, Tecnolog{\'i}a e Innovaci{\'o}n Productiva (Argentina). Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, and the US Department of Energy Office of Science. The SDSS-III web site is http://www.sdss9.org/. This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. The MultiDark Database used in this paper and the web application providing online access to it were constructed as part of the activities of the German Astrophysical Virtual Observatory as result of a collaboration between the Leibniz-Institute for Astrophysics Potsdam (AIP) and the Spanish MultiDark Consolider Project CSD2009-00064. The Bolshoi and MultiDark simulations were run on theNASA's Pleiades supercomputer at theNASAAmes Research Center. The MDPL and the BigMD simulation suite have been performed in the Supermuc supercomputer at LRZ using time granted by PRACE. IRAF is distributed by the National Optical Astronomy Observatory, which is operated by AURA under a cooperative agreement with the National Science Foundation. This work has made use of IPYTHON (Prez & Granger 2007) and of the PYTHON packages NUMPY and SCIPY. Plots have been made using MATPLOTLIB (Hunter 2007). Publisher Copyright: {\textcopyright} 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.",
year = "2016",
month = sep,
day = "1",
doi = "10.1093/mnras/stw1284",
language = "English (US)",
volume = "461",
pages = "248--270",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "1",
}