Astronomy & Astrophysics

Issue		A&A Volume 500, Number 2, June III 2009
Page(s)		657 - 665
Section		Cosmology (including clusters of galaxies)
DOI		10.1051/0004-6361/200811077
Published online		08 April 2009

A&A 500, 657-665 (2009)
DOI: 10.1051/0004-6361/200811077

CFHTLS weak-lensing constraints on the neutrino masses

I. Tereno^{1, 2}, C. Schimd^{3, 4}, J.-P. Uzan², M. Kilbinger², F. H. Vincent², and L. Fu^{5, 2, 6}

¹ Argelander-Institut für Astronomie, Auf dem Hügel 71, 53121 Bonn, Germany
e-mail: tereno@astro.uni-bonn.de
² Institut d'Astrophysique de Paris, CNRS UMR 7095 & UPMC, 98 bis bd Arago, 75014 Paris, France
³ Laboratoire d'Astrophysique de Marseille, 38 rue Joliot-Curie, 13388 Marseille, France
⁴ Université de Provence – Aix - Marseille I , Marseille, France
⁵ INAF – Osservatorio Astronomico di Capodimonte, via Moiariello 16, 80131 Napoli, Italy
⁶ Shanghai Key Lab for Astrophysics, Shanghai Normal University, 200234 Shanghai, PR China

Received 3 October 2008 / Accepted 7 February 2009

Abstract
Context. Oscillation experiments yield strong evidence that at least some neutrinos are massive. As a hot dark-matter component, massive neutrinos should modify the expansion history of the Universe as well as the evolution of cosmological perturbations, in a different way from cold dark matter or dark energy.
Aims. We use the latest release of CFHTLS cosmic-shear data to constrain the sum of the masses $\sum m_\nu$ of neutrinos, assuming three degenerate mass states. We also consider a joint analysis including other cosmological observables, notably CMB anisotropies, baryonic acoustic oscillations, and distance modulus from type Ia supernovae.
Methods. Combining CAMB with a lensing code, we compute the aperture mass variance using a suitable recipe to deal with matter perturbations in the non-linear regime. The statistical analysis is performed by sampling an 8-dimensional likelihood on a regular grid as well as using the importance sampling technique.
Results. We obtain the first constraint on neutrino masses based on cosmic-shear data, and combine CFHTLS with WMAP, SDSS, 2dFGRS, Gold-set, and SNLS data. The joint analysis yields 0.03 eV $< \sum m_\nu < 0.54$ eV at the 95% confidence level. The preference for massive neutrinos vanishes when systematics are included.

Key words: cosmology: cosmological parameters -- neutrinos -- cosmology: large-scale structure of Universe -- gravitational lensing

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