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27 April 2024

» arxiv » 1512.0910

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The Atacama Cosmology Telescope: Dynamical masses for 44 SZ-selected galaxy clusters over 755 square degrees
Cristóbal Sifón ; Nick Battaglia ; Felipe Menanteau ; Matthew Hasselfield ; L. Felipe Barrientos ; J. Richard Bond ; Devin Crichton ; Mark J. Devlin ; Rolando Dünner ; Matt Hilton ; Adam D. Hincks ; Renée Hlozek ; Kevin M. Huffenberger ; John P. Hughes ; Leopoldo Infante ; Arthur Kosowsky ; Danica Marsden ; Tobias A. Marriage ; Kavilan Moodley ; Michael D. Niemack ; Lyman A. Page ; David N. Spergel ; Suzanne T. Staggs ; Hy Trac ; Edward J. Wollack ;
Date:	Thu, 3 Dec 2015 00:20:33 GMT (1841kb,D)
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 $M_{200}$ are in the range $(1-15) imes10^{14}M_odot$. 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 $1.10pm0.13$, consistent with previous determinations at these mass scales.
Source:	arXiv, 1512.0910
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