Noise Correlations in Cosmic Microwave Background Experiments
Abstract
Many analyses of microwave background experiments neglect the correlation of noise in different frequency or polarization channels. We show that these correlations, should they be present, can lead to severe misinterpretation of an experiment. In particular, correlated noise arising from either electronics or atmosphere may mimic a cosmic signal. We quantify how the likelihood function for a given experiment varies with noise correlation, using both simple analytic models and actual data. For a typical microwave background anisotropy experiment, noise correlations at the level of 1\% of the overall noise can seriously {\it reduce} the significance of a given detection.
 Publication:

The Astrophysical Journal
 Pub Date:
 February 1995
 DOI:
 10.1086/187755
 arXiv:
 arXiv:astroph/9402053
 Bibcode:
 1995ApJ...440L..37D
 Keywords:

 Anisotropy;
 Background Radiation;
 Channel Noise;
 Cosmology;
 Microwaves;
 Statistical Correlation;
 Data Reduction;
 Likelihood Ratio;
 Mathematical Models;
 Astrophysics;
 COSMOLOGY: COSMIC MICROWAVE BACKGROUND;
 METHODS: DATA ANALYSIS;
 Astrophysics
 EPrint:
 Analysis generalized