The faint end of the Centaurus A satellite luminosity function
  The Panoramic Imaging Survey of Centaurus and Sculptor (PISCeS) is
constructing a wide-field map of the resolved stellar populations in the
extended halos of these two nearby, prominent galaxies. We present new
Magellan/Megacam imaging of a $\sim3$ deg$^2$ area around Centaurus A (Cen A),
which filled in much of our coverage to its south, leaving a nearly complete
halo map out to a projected radius of $\sim$150 kpc and allowing us to identify
two new resolved dwarf galaxies. We have additionally obtained deep Hubble
Space Telescope (HST) optical imaging of eleven out of the thirteen candidate
dwarf galaxies identified around Cen A and presented in Crnojevi\'c et al.
(2016): seven are confirmed to be satellites of Cen A, while four are found to
be background galaxies. We derive accurate distances, structural parameters,
luminosities and photometric metallicities for the seven candidates confirmed
by our HST/ACS imaging. We further study the stellar population along the
$\sim$60 kpc long (in projection) stream associated with Dw3, which likely had
an initial brightness of $M_{V}$$\sim$$-$15 and shows evidence for a
metallicity gradient along its length. Using the total sample of eleven dwarf
satellites discovered by the PISCeS survey, as well as thirteen brighter
previously known satellites of Cen A, we present a revised galaxy luminosity
function for the Cen A group down to a limiting magnitude of $M_V\sim-8$, which
has a slope of $-1.14\pm0.17$, comparable to that seen in the Local Group and
in other nearby groups of galaxies.
