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

Creators: Sayers, J.; Golwala, S. R.; Rossinot, P.; Ade, P. A. R.; Aguirre, J. E.; Bock, J. J.; Edgington, S. F.; Glenn, J.; Goldin, A.; Haig, D.; Lange, A. E.; Laurent, G. T.; Mauskopf, P. D.; Nguyen, H. T.

Abstract

We have surveyed two science fields totaling 1 deg² with Bolocam at 2.1 mm to search for secondary Cosmic Microwave Background (CMB) anisotropies caused by the Sunyaev-Zel'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 ℓ_eff = 5700 with FWHM_ℓ = 2800 and has an angular resolution of 60 arcsec 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 C_ℓ, with most frequent 68%, 90%, and 95% CL upper limits of 590, 760, and 830 μK²_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 most frequent 68%, 90%, and 95% CL upper limits on a flat-band power in C_ℓ are 690, 960, and 1000 μK²_CMB. When we instead employ the analytical spectrum suggested by Komatsu and Seljack in 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 μK²_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.

Additional Information

© 2009. The American Astronomical Society. Received 2008 May 20; accepted 2008 September 14; published 2008 December 22. Print publication: Issue 2 (2009 January 10). We acknowledge the assistance of Minhee Yun and Anthony D. Turner of NASA's Jet Propulsion Laboratory, who fabricated the Bolocam science array; Toshiro Hatake of the JPL electronic packaging group, who wire-bonded the array; Marty Gould of Zen Machine and Ricardo Paniagua and the Caltech PMA/GPS Instrument Shop, who fabricated much of the Bolocam hardware; Carole Tucker of Cardiff University, who tested metal-mesh reflective filters used in Bolocam; Ben Knowles of the University of Colorado, who contributed to the software pipeline, the day crew and Hilo staff of the Caltech Submillimeter Observatory, who provided invaluable assistance during commissioning and data-taking for this survey data set; and Kathy Deniston, who provided effective administrative support at Caltech. Bolocam was constructed and commissioned using funds from NSF/AST-9618798, NSF/AST-0098737, NSF/AST-9980846, NSF/AST-0229008, and NSF/AST-0206158. J.S. and G.L. were partially supported by NASA Graduate Student Research Fellowships and S.G. was partially supported by an R.A. Millikan Postdoctoral Fellowship at Caltech. [J.E.A. was a] Jansky Fellow, National Radio Astronomy Observatory. Facilities: CSO.

Errata

Erratum: "A Search for Cosmic Microwave Background Anisotropies on Arcminute Scales With Bolocam" (2009, ApJ, 690, 1597) J. Sayers, S. R. Golwala, P. Rossinot, P. A. R. Ade, J. E. Aguirre, J. J. Bock, S. F. Edgington, J. Glenn, A. Goldin, D. Haig, A. E. Lange, G. T. Laurent, P. D. Mauskopf, and H. T. Nguyen 2009 ApJ 692 942 doi: 10.1088/0004-637X/692/1/942

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