Degree Scale Anisotropy: SP94 Results

• Main Authors: Gundersen, J., Lim, M., Staren, J., Wuensche, C., Figueiredo, N., Koch, T. Gaier T., Meinhold, P., Seiffert, M., Cook, G., Segale, A., Lubin, P.
• Format: Report
• Language: unknown
• Published: arXiv 1994
• Subjects: Astrophysics astro-ph; FOS Physical sciences; Austral; South Pole; South pole
• Online Access: https://dx.doi.org/10.48550/arxiv.astro-ph/9412020; https://arxiv.org/abs/astro-ph/9412020

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 ($\pm 1σ$) of the combined (Ka+Q) data is $ΔT_{rms}=42.0_{-6.8}^{+15.8}$ $μ$K in a band of multipoles between $\ell=68^{+38}_{-32}$. A band power estimate of the CMB power spectrum, $C_\ell$, gives $\left\langle \frac{C_\ell \ell (\ell+1)}{2π}\right\rangle_B= 1.77_{-0.54}^{+1.58}\times 10^{-10}$. 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. : 14 pgs., LaTeX, 2 figs., submitted to APJL