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

Abstract:

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...

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Publisher copy:
10.1086/311514

Authors


Ferreira, PG More by this author
Magueijo, J More by this author
Górski, KM More by this author
Journal:
Astrophys.J.
Volume:
503
Pages:
L1-L4
Publication date:
1998-03-21
DOI:
URN:
uuid:0b9a2320-9ed3-4a7a-bec9-c113dc8322bb
Source identifiers:
208135
Local pid:
pubs:208135
Keywords:

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