New Limits on the Polarized Anisotropy of the Cosmic Microwave Background at Subdegree Angular Scales
M. M. Hedman, D. Barkats, J. O. Gundersen, J. J. McMahon, S. T. Staggs, B. Winstein
Abstract
We update the limit from the 90 GHz PIQUE ground-based polarimeter on the magnitude of any polarized anisotropy of the cosmic microwave radiation. With a second year of data, we have now limited both Q and U on a ring of 1 degree radius. The window functions are broad: for E-mode polarization, the effective l is <l> = 191 +143 -132. We find that the E-mode signal can be no greater than 8.4 microK (95% CL), assuming no B-mode polarization. Limits on a possible B-mode signal are also presented.
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