A link between feedback outflows and satellite galaxy suppression
  We suggest a direct link between the two "missing" baryon problems of
contemporary galaxy formation theory: (1) that large galaxies are known to
contain too little gas and stars and (2) that too few dwarf satellite galaxies
are observed around large galaxies compared with cosmological simulations. The
former can be explained by invoking some energetic process -- most likely AGN
or star formation feedback -- which expels to infinity a significant fraction
of the gas initially present in the proto-galaxy, while the latter problem is
usually explained by star formation feedback inside the dwarf or tidal and ram
pressure stripping of the gas from the satellite galaxy by its parent. Here we
point out that the host galaxy "missing" baryons, if indeed ejected at
velocities of hundreds to a thousand km s$^{-1}$, must also affect smaller
satellite galaxies by stripping or shocking the gas there. We estimate the
fraction of gas removed from the satellites as a function of the satellite
galaxy's properties. Applying these results to a Milky Way like dark matter
halo, we find that this singular shock ram pressure stripping event may be
quite efficient in removing the gas from the satellites provided that they are
close enough. We also use the orbital and mass modelling data for eight
Galactic dwarf spheroidal (dSph) satellites, and find that it is likely that
many of them have been affected by the Galactic outflow. We point out that
galactic outflows of the host may also trigger a starburst in the satellite
galaxies by over-pressuring their gas discs. This process may be responsible
for the formation of the globular clusters observed in some of the Milky Way's
dSphs (e.g. the Fornax and Sagittarius dSphs).
