Degree Scale Anisotropy: SP94 Results

Abstract

We present results from 2 observations of the CMB performed from the South Pole during the 93-94 austral summer. Each observation employed a 3${}^{\circ }$ peak to peak sinusoidal, single difference chop and consisted of a $20^{\circ }\times 1^{\circ }$ strip on the sky near our SP91 observations. The first observation used a Q-band receiver which operates in 3 bands between 38 and 45 GHz with a $1^{\circ }$ to $1_{\cdot }^{\circ }15$ FWHM beam. The second observation overlapped the first observation and used a Ka-band receiver which operates in 4 bands between 26 and 36 GHz with a $1_{\cdot }^{\circ }25$ to $1_{\cdot }^{\circ }7$ FWHM beam. Significant correlated structure is observed in all bands for each observation. The spectrum of the structure is consistent with a CMB spectrum; however, the data do not discriminate against flat or inverted spectrum point sources. The root mean square amplitude ($\pm 1\ddot{I}ƒ$) of the combined (Ka+Q) data is $\hat{I}”T_{rms}=42.0_{-6.8}^{+15.8}$ $\hat{I}¼$K in a band of multipoles between $\ell =68_{-32}^{+38}$. A band power estimate of the CMB power spectrum, $C_{\ell }$, gives ${⟨\frac{C_{\ell }\ell (\ell +1)}{2\ddot{I}€}⟩}_B=1.77_{-0.54}^{+1.58}\times 10^{-10}$. The band power estimates for the seperate Ka and Q-band results are larger than but consistent with the band power estimate of the combined Ka-band SP91 results.

14 pgs., LaTeX, 2 figs., submitted to APJL