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The Cosmic Background Imager
T. J. Pearson et al.
California Institute of Technology
The Cosmic Background Imager (CBI) is an instrument designed
to make images of the cosmic microwave background radiation and
to measure its statistical properties on angular scales from 5 arc
minutes to one degree (spherical harmonic scales from l  3000
down to l  300). The CBI is a 13-element interferometer
mounted on a 6 meter platform operating in ten 1-GHz frequency
bands from 26 GHz to 36 GHz. The instantaneous eld of view of
the instrument is 44 arcmin and its resolution ranges from 4.5 to
10 arcmin; larger elds can be imaged by mosaicing. At this fre-
quency and resolution, the primary foreground is due to discrete
extragalactic sources, which are monitored at the Owens Valley
Radio Observatory and subtracted from the CBI visibility mea-
surements.
The instrument has been making observations since late 1999 of
both primordial CMB uctuations and the Sunyaev-Zeldovich ef-
fect in clusters of galaxies from its site at an altitude of 5000
meters near San Pedro de Atacama, in northern Chile. Observa-
tions will continue until mid-2001 or later. We will present images
and power-spectrum estimates from the rst few months of obser-
vations.
Co-authors: A. C. S. Readhead, S. Padin, J. K. Cartwright, B.
S. Mason, S. T. Myers, M. C. Shepherd, J. L. Sievers, P. S.
Udomprasert.
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