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We present initial results from our ongoing program to image theSunyaev-Zel'dovich (SZ) effect in galaxy clusters at 143 GHz using Bolocam;five clusters and one blank field are described in this manuscript. The imageshave a resolution of 58 arcsec and a radius of 6-7 arcmin, which isapproximately r500 - 2r500 for these clusters. The beam-smoothed RMS is ~10uK_CMB in these images; with this sensitivity we are able to detect SZ signalto beyond r500 in binned radial profiles. We have fit our images to beta andNagai models, fixing spherical symmetry or allowing for ellipticity in theplane of the sky, and we find that the best-fit parameter values are in generalconsistent with those obtained from other X-ray and SZ data. Our data show noclear preference for the Nagai model or the beta model due to the limitedspatial dynamic range of our images. However, our data show a definitivepreference for elliptical models over spherical models. The weighted meanellipticity of the five clusters is 0.27 +- 0.03, consistent with results fromX-ray data. Additionally, we obtain model-independent estimates of Y500, theintegrated SZ y-parameter over the cluster face to a radius of r500, withsystematics-dominated uncertainties of ~10%. Our Y500 values, which are freefrom the biases associated with model-derived Y500 values, scale with clustermass in a way that is consistent with both self-similar predictions andexpectations of a 10% intrinsic scatter.

Cluster morphologies and model-independent Y_SZ estimates from Bolocam Sunyaev-Zel'dovich images