H-ATLAS/GAMA: Magnification Bias Tomography I. Astrophysical constraints.

Abstract

This work is an update the cross-correlation measurements made by Gonzalez-Nuevo et al. (2014) with better catalogues and wider area in order to split them in different redshift bins. We implement a HOD model to extract astrophysical information about the over-densities that are producing the lensing link between the foreground (lenses) and background (sources) samples. The HOD modelisation allow us to identify a strong lensing contribution to the cross-correlation for angular scales below 30 arcsecs. We need yet to model it to discover what can we learn from it.