New limits on the polarized anisotropy of the cosmic microwave background at subdegree angular scales

We update the limit from the 90 GHz Princeton IQU Experiment 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 1degrees radius. The window functions are broad: for E-mode polarization, the effective l is [l(E)] = 191(-132)(+143). We find that the E-mode signal can be no greater than 8.4 muK (95% CL), assuming no B-mode polarization. Limits on a possible B- mode signal are also presented.