First results from the CBI

Details First results from the CBI First results from the CBI

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..586..178m&link_type=abstract

RELATIVISTIC ASTROPHYSICS: 20th Texas Symposium. AIP Conference Proceedings, Volume 586, pp. 178-183 (2001).

Astronomy and Astrophysics

Astrophysics

3

Background Radiations, Astrometric And Interferometric Instruments, Cosmology

Scientific paper

The Cosmic Background Imager (CBI) is an instrument designed to measure intrinsic anisotropies in the cosmic microwave background (CMB) on angular scales from about 3 arc minutes to one degree (spherical harmonics of l~4250 to l~400). The CBI is a 13 element interferometer mounted on a 6 meter platform operating in ten 1-GHz frequency bands from 26 to 36 GHz. We present a review of the capabilities of the instrument and a discussion of observations which have been taken over the past year from the Atacama desert of Chile. We also present first results from the CBI which show a strong cutoff in the power spectrum between l=600 and l=1200 which is consistent with the photon-diffusive damping predicted by most models of structure formation in the early universe. We discuss future topics which the CBI will address. .

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