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Redshift space distortions are an important probe of the growth oflarge-scale structure and for constraining cosmological parameters in general.As galaxy redshift surveys approach percent level precision in theirobservations of the two point clustering statistics, it is timely to reviewwhat effects baryons and associated processes such as feedback may have onsmall-scale clustering in redshift space. Contrary to previous studies in theliterature, we show using the large-volume BAHAMAS hydrodynamic simulationsthat the effect of baryons can be as much as 1% in the k ~ 0.1 h/Mpc range forthe 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 differencecan be as much 3-4% in the monopole on scales of 0.05 < k < 0.3 h/Mpc for10^{13} M_sun/h haloes. We find that these deviations can be mitigated to thesub-percent level in the both the monopole and quadrupole up to k ~ 0.3 h/Mpcif the baryon corrected halo masses are used to calculate the redshift spacepower spectra. Finally, we use the cosmo-OWLS simulation suite to explore thechanges in the redshift space power spectra with different feedbackprescriptions, finding that there is a maximum of 15-20% difference between theredshift space monopole and quadrupole with and without baryons at k ~1-2 h/Mpcwithin these models.

Revisiting the effects of baryon physics on small-scale redshift space distortions