Angular Momentum of Dwarf Galaxies
  We present measurements of baryonic mass Mb and specific angular momentum
(sAM) jb in 14 rotating dwarf Irregular (dIrr) galaxies from the LITTLE THINGS
sample. These measurements, based on 21cm kinematic data from the Very Large
Array and stellar mass maps from the Spitzer Space Telescope, extend previous
AM measurements by more than two orders of magnitude in Mb. The dwarf galaxies
show systematically higher jb values than expected from the jb~Mb^{2/3} scaling
of spiral galaxies, representative of a scale-free galaxy formation scenario.
This offset can be explained by decreasing baryon mass fractions fM=Mb Mdyn
(where Mdyn is the dynamical mass) with decreasing Mb (for Mb<10^{11}Msun). We
find that the sAM of neutral atomic hydrogen HI alone is about 2.5 times higher
than that of the stars. The M-j relation of HI is significantly steeper than
that of the stars, as a direct consequence of the systematic variation of the
HI fraction with Mb.
