HAL : in2p3-00178861, version 1

arXiv : 0710.2290

Code Bibliographique ADS : 2007arXiv0710.2290B

DOI : 10.1088/1475-7516/2008/02/009

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Journal of Cosmology and Astroparticle Physics 02 (2008) 009

Estimates of multipolar coefficients to search for cosmic ray anisotropies with non-uniform or partial sky coverage

P. Billoir1, O. Deligny2

(2008)

We study the possibility to extract the multipolar moments of an underlying distribution from a set of cosmic rays observed with non-uniform or even partial sky coverage. We show that if the degree is assumed to be upper bounded by $L$, each multipolar moment can be recovered whatever the coverage, but with a variance increasing exponentially with the bound $L$ if the coverage is zero somewhere. Despite this limitation, we show the possibility to test predictions of a model without any assumption on $L$ by building an estimate of the covariance matrix seen through the exposure function.

1 :	LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
2 :	IPNO - Institut de Physique Nucléaire d'Orsay

Thème(s)

:

Physique/Astrophysique/Cosmologie et astrophysique extra-galactique Planète et Univers/Astrophysique

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Contributeur : Dominique Girod <>

Soumis le : Vendredi 12 Octobre 2007, 13:11:05

Dernière modification le : Mardi 15 Avril 2008, 16:47:44