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Published June 11, 2005 | Published + Accepted Version + Erratum
Journal Article Open

Source subtraction for the extended Very Small Array and 33-GHz source count estimates

Abstract

We describe the source subtraction strategy and observations for the extended Very Small Array (VSA), a cosmic microwave background interferometer operating at 33 GHz. A total of 453 sources were monitored at 33 GHz using a dedicated source subtraction baseline. 131 sources brighter than 20 mJy were directly subtracted from the VSA visibility data. Some characteristics of the subtracted sources, such as spectra and variability, are discussed. The 33-GHz source counts are estimated from a sample selected at 15 GHz. The selection of VSA fields in order to avoid bright sources introduces a bias into the observed counts. This bias is corrected and the resulting source count is estimated to be complete in the flux-density range 20–114 mJy. The 33-GHz source counts are used to calculate a correction to the VSA power spectrum for sources below the subtraction limit.

Additional Information

© 2005 RAS. Accepted 2005 March 21. Received 2005 March 15; in original form 2005 January 7. The authors made use of the data base CATS (Verkhodanov et al. 1997) of the Special Astrophysical Observatory. This research has also made use of the NASA/IPAC Extragalactic Data base (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. The authors thank Luigi Toffolatti for making available his numerical 30-GHz source-count predictions. We thank Tim Pearson and Brian Mason for useful comments on this paper. The authors also thank the referee, Bruce Partridge, for his remarks and useful suggestions, which have improved the overall presentation of this paper.

Errata

Kieran A. Cleary, Angela C. Taylor, Elizabeth Waldram, Richard A. Battye, Clive Dickinson, Rod D. Davies, Richard J. Davis, Ricardo Genova-Santos, Keith Grainge, Michael E. Jones, Rüdiger Kneissl, G. G. Pooley, Rafael Rebolo, Alberto Rubiño-Martin, Richard D.E. Saunders, Paul F. Scott, Anže Slosar, David Titterington, Robert A. Watson, Erratum: Source subtraction for the extended Very Small Array and 33-GHz source count estimates, Monthly Notices of the Royal Astronomical Society, Volume 386, Issue 3, May 2008, Pages 1759–1760, https://doi.org/10.1111/j.1365-2966.2008.13184.x

Attached Files

Published - 360-1-340.pdf

Accepted Version - 0412605.pdf

Erratum - mnras0386-1759.pdf

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Additional details

Created:
August 19, 2023
Modified:
October 23, 2023