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          Institute: MPI für Astrophysik     Collection: Cosmology     Display Documents



ID: 10740.0, MPI für Astrophysik / Cosmology
The trispectrum of the 4 year COBE DMR data
Authors:Kunz, M.; Banday, A. J.; Castro, P. G.; Ferreira, P. G.; Gorski, K. M.
Language:English
Date of Publication (YYYY-MM-DD):2002
Title of Journal:The Astrophysical Journal
Journal Abbrev.:Astrophys. J.
Volume:563
Issue / Number:2
Start Page:L99
End Page:L102
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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 yr COBE Differential Microwave Radiometer experiment 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 completely consistent with predictions for a Gaussian sky. These results reinforce the importance of statistical methods based in harmonic space for quantifying non-Gaussianity.
Free Keywords:cosmic microwave background; cosmology : observations
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astrophysik
External Affiliations:Univ Oxford, Dept Astrophys, Keble Rd, Oxford OX1 3RH, England; Univ Oxford, Dept Astrophys, Oxford OX1 3RH, England; Max Planck Inst Astrophys, D-85741 Garching, Germany; European So Observ, D-8046 Garching, Germany; Univ Warsaw Observ, PL-00478 Warsaw, Poland
Identifiers:ISI:000172853000002
ISSN:0004-637X
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