Modelling high resolution ALMA observations of strongly lensed highly
  star forming galaxies detected by Herschel
  We have modelled high resolution ALMA imaging of six strong gravitationally
lensed galaxies detected by the Herschel Space Observatory. Our modelling
recovers mass properties of the lensing galaxies and, by determining
magnification factors, intrinsic properties of the lensed sub-millimetre
sources. We find that the lensed galaxies all have high ratios of star
formation rate to dust mass, consistent with or higher than the mean ratio for
high redshift sub-millimetre galaxies and low redshift ultra-luminous infra-red
galaxies. Source reconstruction reveals that most galaxies exhibit disturbed
morphologies. Both the cleaned image plane data and the directly observed
interferometric visibilities have been modelled, enabling comparison of both
approaches. In the majority of cases, the recovered lens models are consistent
between methods, all six having mass density profiles that are close to
isothermal. However, one system with poor signal to noise shows mildly
significant differences.
