A Search for Cosmic Microwave Background Anisotropies on Arcminute Scales with Bolocam

We have surveyed two science fields totaling one square degree with Bolocam at 2.1 mm to search for secondary CMB anisotropies caused by the SunyaevZel’dovich effect (SZE). The fields are in the Lynx and Subaru/XMM SDS1 fields. Our survey is sensitive to angular scales with an effective angular multipole of leff = 5700 with FWHMl = 2800 and has an angular resolution of 60 arcseconds FWHM. Our data provide no evidence for anisotropy. We are able to constrain the level of total astronomical anisotropy, modeled as a flat band power in Cl, with frequentist 68%, 90%, and 95% CL upper limits of 590, 760, and 830 μK CMB. We statistically subtract the known contribution from primary CMB anisotropy, including cosmic variance, to obtain constraints on the SZE anisotropy contribution. Now including flux calibration uncertainty, our frequentist 68%, 90% and 95% CL upper limits on a flat band power in Cl are 690, 960, and 1000 μK CMB. When we instead employ the analytic spectrum suggested by Komatsu and Seljak (2002), and account for the non-Gaussianity of the SZE anisotropy signal, we obtain upper limits on the average amplitude of their spectrum weighted by our transfer function of 790, 1060, and 1080 μK CMB. We obtain a 90% CL upper limit on σ8, which normalizes the power spectrum of density fluctuations, of 1.57. These are the first constraints on anisotropy and σ8 from survey data at these angular scales at frequencies near 150 GHz. Division of Physics, Mathematics, & Astronomy, California Institute of Technology, Mail Code 59-33, Pasadena, CA 91125 Physics and Astronomy, Cardiff University, 5 The Parade, P. O. Box 913, Cardiff CF24 3YB, Wales, UK Jansky Fellow, National Radio Astronomy Observatory Center for Astrophysics and Space Astronomy & Department of Astrophysical and Planetary Sciences, University of Colorado, 389 UCB, Boulder, CO 80309 Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109