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.