Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-02-21
Astronomy and Astrophysics
Astrophysics
ApJ accepted for publication. 12 pages Latex (uses AASTEX) and 2 encapsulated postscript figures
Scientific paper
10.1086/304241
Even the most sensitive cosmic microwave background anisotropy experiments have signal to noise ratios <=5, so that an accurate determination of the properties of the cosmological signal requires a careful assessment of the experimental noise. Most of the experiments combine simultaneous multi-channel observations in which the presence of correlated noise is likely. This case is common for ground-based experiments in which an important fraction of the noise could be atmospheric in origin. Here, the way to compute and determine the effects produced by this correlated noise is discussed; in particular, the paper considers the Tenerife experiments (three radiometers at 10, 15 and 33 GHz with two independent receivers each) showing how this effect has been taking into account properly in the more recent analysis of these data. It will be demonstrated that for each of the three radiometers of these experiments, the atmospheric noise is equivalent to a Gaussian noise common to both channels with a coherence time smaller than the binning time, the net effect being an enhancement of the error-bars in the stacked scan as compared with the estimation for the case of pure uncorrelated noise. As expected from the spectral index of the atmosphere, the effect is more important at higher frequencies. The formalism is generalized and applied to the general case of simultaneous multi-channel observations.
No associations
LandOfFree
The estimation of the noise in cosmic microwave background anisotropy experiments does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The estimation of the noise in cosmic microwave background anisotropy experiments, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The estimation of the noise in cosmic microwave background anisotropy experiments will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-399804