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2007MNRAS.382.1225M - Mon. Not. R. Astron. Soc., 382, 1225-1232 (2007/December-2)
Constraining warm dark matter using QSO gravitational lensing.
MIRANDA M. and MACCIO A.V.
Abstract (from CDS):
Starting from a theoretical unperturbed cusp configuration, we analyse the effects of intergalactic haloes in modifying the fluxes of QSO multiple images, giving rise to the so-called anomalous flux ratio. We found that the global effect of such haloes strongly depends on their mass/abundance ratio and it is maximized for haloes in the mass range 106-108M☉.
This result opens up a new possibility to constrain CDM predictions on small scales and test different warm candidates, since free streaming of WDM particles can considerably dampen the matter power spectrum in this mass range. As a consequence, while a (Λ)CDM model is able to produce flux anomalies at a level similar to those observed, a WDM model, with an insufficiently massive particle, fails to reproduce the observational evidences.
Our analysis suggests a lower limit of a few keV (mν∼ 10) for the mass of WDM candidates in the form of a sterile neutrino. This result makes sterile neutrino WDM less attractive as an alternative to CDM, in good agreement with previous findings from Lyman α forest and cosmic microwave background analysis.
Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS
Journal keyword(s): gravitational lensing - galaxies: haloes - cosmology: theory - dark matter
Simbad objects: 6
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