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We describe in detail our characterization of the compact radio sourcepopulation in 140 GHz Bolocam observations of a set of 45 massive galaxyclusters. We use a combination of 1.4 and 30 GHz data to select a total of 28probable cluster-member radio galaxies and also to predict their 140 GHz fluxdensities. All of these galaxies are steep-spectrum radio sources and they arefound preferentially in the cool-core clusters within our sample. Inparticular, 11 of the 12 brightest cluster member radio sources are associatedwith cool-core systems. Although none of the individual galaxies are robustlydetected in the Bolocam data, the ensemble-average flux density at 140 GHz isconsistent with, but slightly lower than, the extrapolation from lowerfrequencies assuming a constant spectral index. In addition, our data indicatean intrinsic scatter of 30 percent around the power-law extrapolated fluxdensities at 140 GHz, although our data do not tightly constrain this scatter.For our cluster sample, which is composed of high-mass and moderate-redshiftsystems, we find that the maximum fractional change in the Sunyaev-Zel'dovichsignal integrated over any single cluster due to the presence of these radiosources is 20 percent, and only 1/4 of the clusters show a fractional change ofmore than 1 percent. The amount of contamination is strongly dependent oncluster morphology, and nearly all of the clusters with more than 1 percentcontamination are cool-core systems. This result indicates that radiocontamination is not significant compared to current noise levels in 140 GHzimages of massive clusters and is in good agreement with the level of radiocontamination found in previous results based on lower frequency data orsimulations.

astrophysical journal/the astrophysical journal

The Contribution of Radio Galaxy Contamination to Measurements of the  Sunyaev-Zel'dovich Decrement in Massive Galaxy Clusters at 140 GHz with  Bolocam