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Cosmic microwave background observations from the Cosmic Background Imager and Very Small Array: a comparison of coincident maps and parameter estimation methods

Authors :
Nutan Rajguru
Steven T. Myers
Richard A. Battye
J. Richard Bond
Kieran Cleary
Carlo R. Contaldi
Rod D. Davies
Richard J. Davis
Clive Dickinson
Ricardo Genova-Santos
Keith Grainge
Yaser A. Hafez
Michael P. Hobson
Michael E. Jones
Rüdiger Kneissl
Katy Lancaster
Anthony Lasenby
Brian S. Mason
Timothy J. Pearson
Guy G. Pooley
Anthony C. S. Readhead
Rafael Rebolo
Graca Rocha
José Alberto Rubiño-Martin
Richard D. E. Saunders
Richard S. Savage
Anna Scaife
Paul F. Scott
Jonathan L. Sievers
Anže Slosar
Angela C. Taylor
David Titterington
Elizabeth Waldram
Robert A. Watson
Althea Wilkinson
Source :
Monthly Notices of the Royal Astronomical Society. 363:1125-1135
Publication Year :
2005
Publisher :
Oxford University Press (OUP), 2005.

Abstract

We present coincident observations of the Cosmic Microwave Background (CMB) from the Very Small Array (VSA) and Cosmic Background Imager (CBI) telescopes. The consistency of the full datasets is tested in the map plane and the Fourier plane, prior to the usual compression of CMB data into flat bandpowers. Of the three mosaics observed by each group, two are found to be in excellent agreement. In the third mosaic, there is a 2σ discrepancy between the correlation of the data and the level expected from Monte Carlo simulations. This is shown to be consistent with increased phase calibration errors on VSA data during summer observations. We also consider the parameter estimation method of each group. The key difference is the use of the variance window function in place of the bandpower window function, an approximation used by the VSA group. A re-evaluation of the VSA parameter estimates, using bandpower windows, shows that the two methods yield consistent results.

Details

ISSN :
00358711
Volume :
363
Database :
OpenAIRE
Journal :
Monthly Notices of the Royal Astronomical Society
Accession number :
edsair.doi...........7311571dd8a3babe05915c154a64ef87
Full Text :
https://doi.org/10.1111/j.1365-2966.2005.09519.x