Full-sky CMB lensing reconstruction in presence of sky-cuts

¹ Department of Physics and AstronomyUniversity College London, London WC1E 6BT, UK
e-mail: benoitl@star.ucl.ac.uk
² Institut d’Astrophysique de Paris, CNRS, UMR 7095, Université Pierre & Marie Curie, 98bis boulevard Arago, 75014 Paris, France
³ Astroparticule et Cosmologie, CNRS UMR 7164, Université Denis Diderot Paris 7, Bâtiment Condorcet, 10 rue A. Domon et L. Duquet, 75013 Paris, France
⁴ Laboratoire Traitement et de l’Information, CNRS UMR 5141 and Télécom ParisTech, 46 rue Barrault, 75634 Paris Cedex 13, France
⁵ Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
⁶ Departement of Physics, McGill University, Montreal, QC H3A 2T8, Canada

Received: 6 January 2013
Accepted: 13 March 2013

Abstract

We consider the reconstruction of the CMB lensing potential and its power spectrum on the full sphere in presence of sky-cuts due to point sources and Galactic contamination. These two effects are treated separately. Small regions contaminated by point sources are filled in using constrained Gaussian realizations. The Galactic plane is simply removed using an apodized mask before lensing reconstruction. This algorithm recovers the power spectrum of the lensing potential with no significant bias.