New non-Gaussian feature in COBE-DMR Four Year Maps

Astronomy and Astrophysics – Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Replaced with revised version. Two typos in and around equation (3) have been corrected (components of bispectrum are of the f

Scientific paper

10.1086/312431

We extend a previous bispectrum analysis of the Cosmic Microwave Background temperature anisotropy, allowing for the presence of correlations between different angular scales. We find a strong non-Gaussian signal in the ``inter-scale'' components of the bispectrum: their observed values concentrate close to zero instead of displaying the scatter expected from Gaussian maps. This signal is present over the range of multipoles $\ell=6 -18$, in contrast with previous detections. We attempt to attribute this effect to galactic foreground contamination, pixelization effects, possible anomalies in the noise, documented systematic errors studied by the COBE team, and the effect of assumptions used in our Monte Carlo simulations. Within this class of systematic errors the confidence level for rejecting Gaussianity varies between 97% and 99.8%.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

New non-Gaussian feature in COBE-DMR Four Year Maps 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 New non-Gaussian feature in COBE-DMR Four Year Maps, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and New non-Gaussian feature in COBE-DMR Four Year Maps will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-238719

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.