Evidence for non-Gaussianity in the COBE DMR Four Year Sky Maps

Details Evidence for non-Gaussianity in the COBE DMR Four Year Sky Maps Evidence for non-Gaussianity in the COBE DMR Four Year Sky Maps

1998-03-21

arxiv.org/abs/astro-ph/9803256v2

Astrophys.J. 503 (1998) L1-L4

Astronomy and Astrophysics

Astrophysics

16 pages, 3 figs uses aasms4.tex, revised and accepted to Ap. J. Lett

Scientific paper

10.1086/311514

We introduce and study the distribution of an estimator for the normalized bispectrum of the Cosmic Microwave Background (CMB) anisotropy. We use it to construct a goodness of fit statistic to test the coadded 53 and 90 GHz COBE-DMR 4 year maps for non-Gaussianity. Our results indicate that Gaussianity is ruled out at the confidence level in excess of 98%. This value is a lower bound, given all the investigated systematics. The dominant non-Gaussian contribution is found near the multipole of order $\ell=16$. Our attempts to explain this effect as caused by the diffuse foreground emission from the Galaxy have failed. We conclude that unless there exists a microwave foreground emission which spatially correlates neither with the DIRBE nor Haslam maps, the cosmological CMB anisotropy is genuinely non-Gaussian.

Affiliated with

Also associated with

No associations

Rating

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

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-49706