Constraining dark matter halo properties using lensed SNLS supernovae

Understand

This paper exploits the gravitational magnification of SNe Ia to measure properties of dark matter haloes.

• The magnification of individual SNe Ia can be computed using observed properties of foreground galaxies and dark matter halo models.
• We model the dark matter haloes of the galaxies as truncated singular isothermal spheres with velocity dispersion and truncation radius obeying luminosity dependent scaling laws.
• A homogeneously selected sample of 175 SNe Ia from the first 3-years of the Supernova Legacy Survey (SNLS) in the redshift range 0.2 < z < 1 is used to constrain models of the dark matter haloes associated with foreground galaxies.