A measurement at the first acoustic peak of the CMB with the 33 GHz interferometer

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Accepted for publication in MNRAS, 6 pages, latex, 5 figures. Revised version includes an extra figure and a few minor changes

Scientific paper

10.1046/j.1365-8711.2000.03762.x

This paper presents the results from the Jodrell Bank-IAC two-element 33 GHz interferometer operated with an element separation of 32.9 wavelengths and hence sensitive to 1 deg scale structure on the sky. The level of CMB fluctuations, assuming a flat CMB spatial power spectrum over the range of multipoles l = 208 +- 18, was found using a likelihood analysis to be \Delta T_l = 63^{+7}_{-6} mu K at the 68% confidence limit, after the subtraction of the contribution of monitored point sources. Other possible foreground contributions have been assessed and are expected to have negligible impact on this result.

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