The universal rotation curve of dwarf disk galaxies
  We use the concept of the spiral rotation curves universality to investigate
the luminous and dark matter properties of the dwarf disc galaxies in the local
volume (size $\sim11$ Mpc). Our sample includes 36 objects with rotation curves
carefully selected from the literature. We find that, despite the large
variations of our sample in luminosities ($\sim$ 2 of dex), the rotation curves
in specifically normalized units, look all alike and lead to the lower-mass
version of the universal rotation curve of spiral galaxies found in Persic et
al. We mass model the double normalized universal rotation curve
$V(R/R_{opt})/V_{opt}$ of dwarf disc galaxies: the results show that these
systems are totally dominated by dark matter whose density shows a core size
between 2 and 3 stellar disc scale lengths. Similar to galaxies of different
Hubble types and luminosities, the core radius $r_0$ and the central density
$\rho_0$ of the dark matter halo of these objects are related by $ \rho_0 r_0
\sim 100\hspace{0.1cm} \mathrm{M_\odot pc^{-2}}$. The structural properties of
the dark and luminous matter emerge very well correlated. In addition, to
describe these relations, we need to introduce a new parameter, measuring the
compactness of light distribution of a (dwarf) disc galaxy. These structural
properties also indicate that there is no evidence of abrupt decline at the
faint end of the baryonic to halo mass relation. Finally, we find that the
distributions of the stellar disc and its dark matter halo are closely related.
