Anisotropy in the Microwave Sky at 90 GH[CLC]z[/CLC]: Results from Python III

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Abstract
The third year of observations with the Python microwave background experiment densely samples a 55 × 22° region of sky that includes the fields measured during the first 2 years of observations with this instrument. The sky is sampled in two multipole bands centered at l ≈ 87 and l ≈ 170. These two data sets are analyzed to place limits on fluctuations in the microwave sky at 90 GHz. Interpreting the observed fluctuations as anisotropy in the cosmic microwave background, we find flat-band power estimates of δTl ≡ [l(l + 1)Cl/(2π)]1/2 = 60−13+15 μK at l = 87−38+18 and δTl = 66−16+17 μK at l = 170−50+69. Combining the entire 3 year set of Python observations, we find that the angular power spectrum of fluctuations has a spectral index m = 0.16−.18+.20 and an amplitude δT le = 63−14+15 μK at le = 139−34+99 for the functional form δTl = δT le(l/le)m. The stated uncertainties in the amplitudes and spectral index represent 1 σ confidence intervals in the likelihood added in quadrature with a 20% calibration uncertainty and an estimate of the effects of a ±005 uncertainty in the measured beamwidths. The limits of l are determined from the half-maximum points of the window functions.
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