Results From MAT: Localizing a Peak in the CMB Angular Spectrum to $l\approx 200$
A. D. Miller, R. Caldwell, M. J. Devlin, W. B. Dorwart, T. Herbig, M. R. Nolta, L. A. Page, J. Puchalla, E. Torbet, and H. T. Tran
Department of Physics, Princeton University, Princeton, NJ,
and Departments of Physics and Astronomy, University of Pennsylvania,
Philadelphia, PA USA

We report results from the 1997 and 1998 observing seasons of the Mobile Anisotropy Telescope. We detect anisotropy in the cosmic microwave background on scales from $l\approx 50$ to $l\approx 400$ at 30, 40, and 144 GHz. We find clear evidence for a peak in the spectrum localized at $l \approx 200$ with an amplitude, $\delta T_l \approx 85\mu$K. We find that the data have a spectral index consistent with that of the CMB.