Dipole Distortions in the Intergalactic Medium
  Baryonic feedback can significantly modify the spatial distribution of matter
on small scales and create a bulk relative velocity between the dominant cold
dark matter and the hot gas. We study the consequences of such bulk motions
using two high resolution hydrodynamic simulations, one with no feedback and
one with very strong feedback. We find that relative velocities of order $100\
\kms$ are produced in the strong feedback simulation whereas it is much smaller
when there is no feedback. Such relative motions induce dipole distortions to
the gas, which we quantify by computing the dipole correlation function. We
find halo coordinates and velocities are systematically changed in the
direction of the relative velocity. Finally, we discuss potential to observe
the relative velocity via large scale structure, Sunyaev-Zel'dovich and line
emission measurements. Given the nonlinear nature of this effect, it should
next be studied in simulations with different feedback
implementations/strengths to determine the available model space.
