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The Trispectrum of the 4 Year COBE-DMR data
M. Kunz, A. J. Banday, P. G. Castro +2
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…
All-sky astrophysical component separation with Fast Independent Component Analysis (FastICA)
D. Maino, A. Farusi, C. Baccigalupi +7
We present a new, fast, algorithm for the separation of astrophysical components superposed in maps of the sky, based on the fast Independent Component Analysis technique (FastICA)…
Measurement of the cosmic microwave background bispectrum on the COBE DMR sky maps
Eiichiro Komatsu, Benjamin D. Wandelt, David N. Spergel +2
We measure the angular bispectrum of the cosmic microwave background (CMB) radiation anisotropy from the COBE Differential Microwave Radiometer (DMR) four-year sky maps. The angula…
Spherical Mexican Hat wavelet: an application to detect non-Gaussianity in the COBE-DMR maps
L. Cayon, J. L. Sanz, E. Martinez-Gonzalez +5
The spherical Mexican Hat wavelet is introduced in this paper, with the aim of testing the Gaussianity of the Cosmic Microwave Background temperature fluctuations. Using the inform…
The angular power spectrum of radio emission at 2.3 GHz
G. Giardino, A. J. Banday, P. Fosalba +4
We have analysed the Rhodes/HartRAO survey at 2326 MHz and derived the global angular power spectrum of Galactic continuum emission. In order to measure the angular power spectrum…