- Abstract:
-
We propose an estimator for the trispectrum of a scalar random field on a sphere, discuss its geometrical and statistical properties, and outline its implementation. By estimating the trispectrum of the 4 year COBE-DMR data (in HEALPix pixelization) we find new evidence of a non-Gaussian signal associated with a known systematic effect. We find that by removing data from the sky maps for those periods of time perturbed by this effect, the amplitudes of the trispectrum coefficients become comp...
Expand abstract - Publisher copy:
- 10.1086/338602
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- Journal:
- Astrophys. J.
- Volume:
- 563
- Pages:
- L99
- Publication date:
- 2001-11-13
- DOI:
- URN:
-
uuid:d0b93746-0834-478f-91c5-860048f294a7
- Source identifiers:
-
208091
- Local pid:
- pubs:208091
- Keywords:
- Copyright date:
- 2001
- Notes:
-
4 pages, 2 figures, emulateapj style. Updated to match published
version
Journal article
The Trispectrum of the 4 Year COBE-DMR data
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