S. Masi et al., FOREGROUNDS REMOVAL AND CMB FLUCTUATIONS IN A MULTIBAND ANISOTROPY EXPERIMENT - ARGO 1993, The Astrophysical journal, 463(2), 1996, pp. 47-50
We present the results of a diffuse radiation survey carried out at mi
llimeter and submillimeter wavelengths in the Aries and Taurus sky reg
ions. A balloon-borne telescope with 0 degrees.85 FWHM resolution and
four millimeterwave bands scanned 147 independent sky directions. From
the multiband observations we were able to separate two independent c
omponents: thermal emission from cirrus dust and cosmic microwave back
ground (CMB) temperature fluctuations. A statistically significant det
ection of anisotropies is found in the data of the CMB channel: Delta
T-sky = (24 +/- 7) mu K rms (95% CL plus 10% calibration error). Assum
ing uncorrelated Gaussian temperature fluctuations we find a band aver
aged estimate of the CMB anisotropy power spectrum C-l = (20 +/- 9) mu
K-2 at l similar or equal to 110. The data are consistent with anisot
ropies in a ''standard'' Omega(b) = 0.05, n = 1 model normalized to th
e rms anisotropy detected by COBE Differential Microwave Radiometers.