The PAndAS view of the Andromeda satellite system - II. Detailed
  properties of 23 M31 dwarf spheroidal galaxies
  We present a comprehensive analysis of the structural properties and
luminosities of the 23 dwarf spheroidal galaxies that fall within the footprint
of the Pan-Andromeda Archaeological Survey (PAndAS). These dwarf galaxies
represent the large majority of Andromeda's known satellite dwarf galaxies and
cover a wide range in luminosity ($-11.6<M_V<-5.8$ or $10^{4.2}< L <10^{6.5}
L_\odot$) and surface brightness ($25.1<\mu_0<29.3$ mag/arcsec$^2$). We confirm
most previous measurements, but find And XIX to be significantly larger than
before ($r_h=3065^{+1065}_{-935}$ pc, $M_V=-10.1^{+0.8}_{-0.4}$) and cannot
derive parameters for And XXVII as it is likely not a bound stellar system. We
also significantly revise downward the luminosities of And~XV and And~XVI,
which are now $M_V\sim-7.5$ or $L\sim10^5 L_\odot$. Finally, we provide the
first detailed analysis of Cas II/And XXX, a fairly faint system
($M_V=-8.0^{+0.4}_{-0.3}$) of typical size ($r_h=270\pm50$ pc), located in
close proximity to the two bright elliptical dwarf galaxies NGC 147 & 185.
Combined with the set of homogeneous distances published in an earlier
contribution, our analysis dutifully tracks all relevant sources of uncertainty
in the determination of the properties of the dwarf galaxies from the PAndAS
photometric catalogue. We further publish the posterior probability
distribution functions of all the parameters we fit for in the form of MCMC
chains available online; these inputs should be used in any analysis that aims
to remain truthful to the data and properly account for covariance between
parameters.
