Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-02-16
Mon.Not.Roy.Astron.Soc. 363 (2005) 1125-1135
Astronomy and Astrophysics
Astrophysics
10 pages, 6 figures. Final version. Accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2005.09519.x
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 2 sigma 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.
Battye Richard A.
Bond Richard J.
Cleary Kieran
Contaldi Carlo R.
Davies Rhodri D.
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