Low X-ray Luminosity Galaxy Clusters. III: Weak Lensing Mass
  Determination at 0.18 $<$ z $<$ 0.70
  This is the third of a series of papers of low X-ray luminosity galaxy
clusters. In this work we present the weak lensing analysis of eight clusters,
based on observations obtained with the Gemini Multi-Object Spectrograph in the
$g'$, $r'$ and $i'$ passbands. For this purpose, we have developed a pipeline
for the lensing analysis of ground-based images and we have performed tests
applied to simulated data. We have determined the masses of seven galaxy
clusters, six of them measured for the first time. For the four clusters with
availably spectroscopic data, we find a general agreement between the velocity
dispersions obtained via weak lensing assuming a Singular Isothermal Sphere
profile, and those obtained from the redshift distribution of member galaxies.
The correlation between our weak lensing mass determinations and the X-ray
luminosities are suitably fitted by other observations of the $M-L_{X}$
relation and models.
