The Complete Bispectrum of COBE-DMR Four Year Maps

Details The Complete Bispectrum of COBE-DMR Four Year Maps The Complete Bispectrum of COBE-DMR Four Year Maps

2000-10-19

arxiv.org/abs/astro-ph/0010395v1

Mon.Not.Roy.Astron.Soc. 325 (2001) 463

Astronomy and Astrophysics

Astrophysics

10 pages, 5 figures

Scientific paper

10.1046/j.1365-8711.2001.04384.x

We extend a previous bispectrum analysis of the COBE-DMR 4 year maps, allowing for the presence of correlations between all possible angular scales. We find that the non-Gaussian signal found earlier for bispectrum components including adjacent modes does not extend to triplets of modes with larger separations. Indeed for all separations $\Delta\ell >1$ we find that the COBE-DMR data is very Gaussian. The implication seems to be that the previously detected non-Gaussian scale-scale correlation falls off very quickly with mode separation.

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