CMB observations from the CBI and VSA: A comparison of coincident maps and parameter estimation methods
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 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.
Cite
@article{arxiv.astro-ph/0502330,
title = {CMB observations from the CBI and VSA: A comparison of coincident maps and parameter estimation methods},
author = {N. Rajguru and S. T. Myers and R. A. Battye and J. Richard Bond and K. Cleary and C. R. Contaldi and R. D. Davies and R. J. Davis and C. Dickinson and R. Genova-Santos and K. Grainge and Y. A. Hafez and M. P. Hobson and M. E. Jones and R. Kneissl and K. Lancaster and A. Lasenby and B. S. Mason and T. J. Pearson and G. G. Pooley and A. C. S. Readhead and R. Rebolo and G. Rocha and J. A. Rubino-Martin and R. D. E. Saunders and R. S. Savage and A. Scaife and P. F. Scott and J. L. Sievers and A. Slosar and A. C. Taylor and D. Titterington and E. Waldram and R. A. Watson and A. Wilkinson},
journal= {arXiv preprint arXiv:astro-ph/0502330},
year = {2009}
}
Comments
10 pages, 6 figures. Final version. Accepted for publication in MNRAS