Angular distribution of gamma-ray emission from velocity-dependent dark
  matter annihilation in subhalos
  We consider the effect of velocity-dependent dark matter annihilation on the
angular distribution of gamma rays produced in dark matter subhalos. We assume
that the dark matter potential is spherically symmetric, characterized by a
scale radius and scale density, and the velocity distribution is isotropic. We
find that the effect of velocity-dependent dark matter annihilation is largely
determined by dimensional analysis; the angular size of gamma-ray emission from
an individual subhalo is rescaled by a factor which depends on the form of the
dark matter distribution, but not on the halo parameters, while the relative
normalization of the gamma-ray flux from different mass subhalos is rescaled by
a factor which depends on the halo parameters, but not on the form of the dark
matter distribution. We apply our results to a Navarro-Frenk-White profile for
the case of an individual subhalo and comment on the application of these
results to a distribution of subhalos.
