Further support for a trio of mass-to-light deviations in Abell 370:
  free-form Grale lens inversion using BUFFALO strong lensing data
  We use the Beyond Ultra-deep Frontier Fields and Legacy Observations
(BUFFALO) strong lensing image catalog of the merging galaxy cluster Abell 370
to obtain a mass model using the free-form lens inversion algorithm GRALE. The
improvement of the strong lensing data quality results in a lens plane rms of
only 0.45 arcsec, about a factor of two lower than that of our existing HFF v4
reconstruction. We attribute the improvement to spectroscopic data and use of
the full reprocessed HST mosaics. In our reconstructed mass model, we found
indications of three distinct mass features in Abell 370: (i) a $\sim 35$ kpc
offset between the northern BCG and the nearest mass peak, (ii) a $\sim 100$
kpc mass concentration of roughly critical density $\sim 250$ kpc east of the
main cluster, and (iii) a probable filament-like structure passing N-S through
the cluster. While (i) is present in some form in most publicly available
reconstructions spanning the range of modeling techniques: parametric, hybrid,
and free-form, (ii) and (iii) are recovered by only about half of the
reconstructions. We tested our hypothesis on the presence of the filament-like
structure by creating a synthetic cluster - Irtysh IIIc - mocking the situation
of a cluster with external mass. We also computed the source plane
magnification distributions. Using them we estimated the probabilities of
magnifications in the source plane, and scrutinized their redshift dependence.
Finally, we explored the lensing effects of Abell 370 on the luminosity
functions of sources at $z_s=9.0$, finding it consistent with published
results.
