Degree scale anisotropy: SP94 results

• Main Authors: Gundersen, J O, Lim, M, Staren, J W, Wünsche, C A, Figueiredo, N, Koch, T G T, Meinhold, P, Seiffert, M, Cook, G, Segale, A, Lubin, P M
• Language: English
• Published: 1994
• Subjects: Astrophysics and Astronomy; Austral; South Pole; South pole
• Online Access: http://cds.cern.ch/record/273493

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\sigma) of the combined (Ka+Q) data is \Delta T_{rms}=42.0_{-6.8}^{+15.8} \muK in a band of multipoles between \ell=68^{+38}_{-32}. A band power estimate of the CMB power spectrum, C_\ell, gives \left\langle \frac{C_\ell \ell (\ell+1)}{2\pi}\right\rangle_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.