2016MNRAS.462.3006L

Following the recently discovery of the Canarias Einstein ring by Bettinelli et al., we present further studies of this system. Searching the DECam data archive, we found i-band images of this system, in additional to the g-, and r-band images presented in Bettinelli et al. Using GALFIT, we are able to model the lens light contribution and derive the lens colour, g - r = 2.27 and r - i = 0.70 mag, indicating that the lens is a luminous red galaxy. After subtracting the lens light, we use LENSVIEW to model the Einstein ring image and obtain an angular Einstein radius of 2.25 arcsec, which translates into an enclosed lens mass of 2.02 x 10¹² M_☉ and a velocity dispersion of 460 km s^–1, assuming the lens has a singular isothermal ellipsoid mass profile. The best-fitting model yields a total magnification of 10.5 and enables us to derive the un-lensed star formation rate of the source to be ∼8 M_☉ yr^–1.