Journal Article

The Cosmic Background Imager 2

Angela C. Taylor, Michael E. Jones, James R. Allison, Emmanouil Angelakis, J. Richard Bond, Leonardo Bronfman, Ricardo Bustos, Richard J. Davis, Clive Dickinson, Jamie Leech, Brian S. Mason, Steven T. Myers, Timothy J. Pearson, Anthony C. S. Readhead, Rodrigo Reeves, Martin C. Shepherd and Jonathan L. Sievers

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 418, issue 4, pages 2720-2729
Published in print December 2011 | ISSN: 0035-8711
Published online December 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19661.x
The Cosmic Background Imager 2

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We describe an upgrade to the Cosmic Background Imager instrument to increase its surface brightness sensitivity at small angular scales. The upgrade consisted of replacing the 13 0.9-m antennas with 1.4-m antennas incorporating a novel combination of design features, which provided excellent sidelobe and spillover performance for low manufacturing cost. Off-the-shelf spun primaries were used, and the secondary mirrors were oversized and shaped relative to a standard Cassegrain in order to provide an optimum compromise between aperture efficiency and low spillover lobes. Low-order distortions in the primary mirrors were compensated for by custom machining of the secondary mirrors. The secondaries were supported on a transparent dielectric foam cone to minimize scattering. The antennas were tested in the complete instrument, and the beam shape and spillover noise contributions were as expected. We demonstrate the performance of the telescope and the intercalibration with the previous system using observations of the Sunyaev–Zel’dovich effect in the cluster Abell 1689. The enhanced instrument has been used to study the cosmic microwave background, the Sunyaev–Zel’dovich effect and diffuse Galactic emission.

Keywords: instrumentation: interferometers; methods: data analysis; cosmic background radiation; X-rays: galaxies: clusters

Journal Article.  7345 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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