Evidence for a Flat Universe from the North American Flight of BOOMERANG
B.P. Crill et al.
California Institute of Technology
Pasadena, CA, USA

BOOMERANG is a millimeter- and submillimeter-wave telescope designed to observe the Cosmic Microwave Background from a stratospheric balloon above Antarctica. In August 1997, a test version of the payload flew in Texas, mapping 200 square degrees of the sky at 90 and 150 GHz at 26' and 17' resolution respectively. A measurement of the power spectrum of this map shows a localized peak of amplitude 75 \( \mu \)K at \( \ell =200 \), evidence supporting the adiabatically seeded cold dark matter paradigm of structure formation. Within the context of these models, a maximum likelihood analysis shows evidence for a flat universe with \( 0.85<\Omega <1.25 \) at the 68\% confidence level.