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We describe Sunyaev-Zel'dovich (SZ) effect measurements and analysis of theintracluster medium (ICM) pressure profiles of a set of 45 massive galaxyclusters imaged using Bolocam at the Caltech Submillimeter Observatory. We haveused masses determined from Chandra X-ray observations to scale each cluster'sprofile by the overdensity radius R500 and the mass-and-redshift-dependentnormalization factor P500. We deproject the average pressure profile of oursample into 13 logarithmically spaced radial bins between 0.07R500 and 3.5R500.We find that a generalized Navarro, Frenk, and White (gNFW) profile describesour 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 todefine cool-core and disturbed subsamples of clusters, and we constrain theaverage pressure profiles of each of these subsamples. We find that given theprecision of our data the average pressure profiles of disturbed and cool-coreclusters are consistent with one another at R>~0.15R500, with cool-core systemsshowing indications of higher pressure at R<~0.15R500. In addition, for thefirst time, we place simultaneous constraints on the mass scaling of clusterpressure profiles, their ensemble mean profile, and their radius-dependentintrinsic scatter between 0.1R500 and 2.0R500. The scatter among profiles isminimized at radii between ~0.2R500 and ~0.5R500, with a value of ~20%. Thebest-fit mass scaling has a power-law slope of 0.49, which is shallower thanthe nominal prediction of 2/3 from self-similar hydrostatic equilibrium models.These results for the intrinsic scatter and mass scaling are largely consistentwith previous analyses, most of which have relied heavily on X-ray derivedpressures of clusters at significantly lower masses and redshifts compared toour sample.

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