Constraints on warm dark matter from weak lensing in anomalous quadruple lenses
Abstract
We investigate the weak lensing effect by line-of-sight structures with a surface mass density of <~10^8 solar mass/arcsec^2 in QSO-galaxy quadruple lens systems. Using high-resolution N-body simulations in warm dark matter (WDM) models and observed four quadruple lenses that show anomalies in the flux ratios, we obtain constraints on the mass of thermal WDM, m_WDM>= 1.3keV(95%CL) assuming that the density of the primary lens is described by a singular isothermal ellipsoid (SIE). The obtained constraint is consistent with those from Lyman- forests and the number counts of high-redshift galaxies at z>4. Our results show that WDM with a free-streaming comoving wavenumber k_{fs} <= 27 h/Mpc is disfavored as the major component of cosmological density at redshifts 0.5 <~ z <~ 4 provided that the SIE models describe the gravitational potentials of the primary lenses correctly.
Keywords
Cite
@article{arxiv.1409.1326,
title = {Constraints on warm dark matter from weak lensing in anomalous quadruple lenses},
author = {Kaiki Taro Inoue and Ryuichi Takahashi and Tomo Takahashi and Tomoaki Ishiyama},
journal= {arXiv preprint arXiv:1409.1326},
year = {2016}
}
Comments
14 pages, 8 figures, version accepted in MNRAS. Information about k_cut is added in table 5 and figure 4