Sunyaev-Zel'dovich-Measured Pressure Profiles from the Bolocam X-ray/SZ Galaxy Cluster Sample

Jack Sayers, Nicole G. Czakon, Adam Mantz, Sunil R. Golwala, Silvia Ameglio, Tom P. Downes, Patrick M. Koch, Kai-Yang Lin, Ben J. Maughan, Sandor M. Molnar, Leonidas Moustakas, Tony Mroczkowski, Elena Pierpaoli, Jennifer A. Shitanishi, Seth Siegel, Keiichi Umetsu, Nina Van der Pyl

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Abstract

We describe Sunyaev-Zel'dovich (SZ) effect measurements and analysis of the intracluster medium (ICM) pressure profiles of a set of 45 massive galaxy clusters imaged using Bolocam at the Caltech Submillimeter Observatory. We have used masses determined from Chandra X-ray observations to scale each cluster's profile by the overdensity radius R500 and the mass-and-redshift-dependent normalization factor P500. We deproject the average pressure profile of our sample into 13 logarithmically spaced radial bins between 0.07R500 and 3.5R500. We find that a generalized Navarro, Frenk, and White (gNFW) profile describes our data with sufficient goodness-of-fit and best-fit parameters (C500, alpha, beta, gamma, P0 = 1.18, 0.86, 3.67, 0.67, 4.29). We also use the X-ray data to define cool-core and disturbed subsamples of clusters, and we constrain the average pressure profiles of each of these subsamples. We find that given the precision of our data the average pressure profiles of disturbed and cool-core clusters are consistent with one another at R>~0.15R500, with cool-core systems showing indications of higher pressure at R
Original languageEnglish
JournalAstrophysical Journal
Volume768
DOIs
Publication statusPublished - 7 Nov 2012

Bibliographical note

updated per the referee's comments

Keywords

  • astro-ph.CO

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