Session 67 - Cosmic Microwave Background.
Oral session, Tuesday, January 16
Salon del Rey North, Hilton

## [67.06] An Upper Limit to Arc-Minute Scale Anisotropies in the Cosmic Microwave Background Radiation at 2.1 mm

S. E. Church, K. M. Ganga (Caltech), P. A. R. Ade (QMW), W. L. Holzapfel, P. D. Mauskopf, T. M. Wilbanks, A. E. Lange (Caltech)

We present limits on anisotropy in the cosmic microwave background radiation (CMB) on angular scales of 1'--4'. The observations were made at a wavelength of 2.1\,mm using the Sunyaev-Zel'dovich Infrared Experiment (SuZIE) bolometer array at the Caltech Submillimeter Observatory (CSO). Two patches of sky (36'\times 4'), free of known sources, were observed for a total of 7 hours each, achieving a sensitivity of 150\muK in each of \sim\,80 independent 1\farcm7 pixels. These data have been combined with various toy'' models for the correlation function of CMB anisotropies. A gaussian autocorrelation function (GACF) sets limits of \Delta T/T < 2\times 10^-5 for coherence angles 0.6'<\theta_c<1.8'. The results are compared to previous measurements on these angular scales.