  Redshift space distortions are an important probe of the growth of
large-scale structure and for constraining cosmological parameters in general.
As galaxy redshift surveys approach percent level precision in their
observations of the two point clustering statistics, it is timely to review
what effects baryons and associated processes such as feedback may have on
small-scale clustering in redshift space. Contrary to previous studies in the
literature, we show using the large-volume BAHAMAS hydrodynamic simulations
that the effect of baryons can be as much as 1% in the k ~ 0.1 h/Mpc range for
the monopole and 5% for quadrupole, and that this could rise to as much as 10%
at k~10 h/Mpc in both measurements. For the halo power spectra, this difference
can be as much 3-4% in the monopole on scales of 0.05 < k < 0.3 h/Mpc for
10^{13} M_sun/h haloes. We find that these deviations can be mitigated to the
sub-percent level in the both the monopole and quadrupole up to k ~ 0.3 h/Mpc
if the baryon corrected halo masses are used to calculate the redshift space
power spectra. Finally, we use the cosmo-OWLS simulation suite to explore the
changes in the redshift space power spectra with different feedback
prescriptions, finding that there is a maximum of 15-20% difference between the
redshift space monopole and quadrupole with and without baryons at k ~1-2 h/Mpc
within these models.
