Extragalactic Strong Lensing : From Discovery to Exploitation
Mock lensing and dark matter profiles form simulated rich clusters
Matthieu Shaller
ICC, Durham University
We use state-of-the-art zoom-in simulations of to analyse the density profile and the distribution of dark matter large clusters (M_200 > 10^15). We find that our simulated BCGs have stellar masses, profiles and colours in good agreement with the observed population whilst retaining a steep dark matter profile all the way to the very centre of the galaxies.
We construct mock-observations of the clusters (velocity dispersion, strong lensing, weak lensing) to assess how well the profiles can be reconstructed from these observations and whether systematic effects impacting the analysis of observational data can be identified. Similarly assumptions such as sphericity, equilibrium or the shape of the velocity anisotropy profile can be tested. We find that these assumptions, when applied to galaxies where they are not verified, lead to systematic differences that would lead to the inference of dark matter cores and other incorrect results on the mass distribution in the haloes.
Creating mock lenses from simulated clusters will also allow practitioners to assess how well standard lensing reconstruction packages do in order to improve the reliability and impact of the HFF lensing maps among others.
13:30 - 15:00
EX - LT2 (200)