Newly discovered dwarf galaxies in the MATLAS low density fields
  We present the photometric properties of 2210 newly identified dwarf galaxy
candidates in the MATLAS fields. The Mass Assembly of early Type gaLAxies with
their fine Structures (MATLAS) deep imaging survey mapped $\sim$142 deg$^2$ of
the sky around nearby isolated early type galaxies using MegaCam on the
Canada-France-Hawaii Telescope, reaching surface brightnesses of $\sim$ 28.5 -
29 in the g-band. The dwarf candidates were identified through a direct visual
inspection of the images and by visually cleaning a sample selected using a
partially automated approach, and were morphologically classified at the time
of identification. Approximately 75% of our candidates are dEs, indicating that
a large number of early type dwarfs also populate low density environments, and
23.2% are nucleated. Distances were determined for 13.5% of our sample using
pre-existing $z_{spec}$ measurements and HI detections. We confirm the dwarf
nature for 99% of this sub-sample based on a magnitude cut $M_g$ = -18.
Additionally, most of these ($\sim$90%) have relative velocities suggesting
that they form a satellite population around nearby massive galaxies rather
than an isolated field sample. Assuming that the candidates over the whole
survey are satellites of the nearby galaxies, we demonstrate that the MATLAS
dwarfs follow the same scaling relations as dwarfs in the Local Group as well
as the Virgo and Fornax clusters. We also find that the nucleated fraction
increases with $M_g$, and find evidence of a morphology-density relation for
dwarfs around isolated massive galaxies.
