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In order to reproduce the high-mass end of the galaxy mass-distribution, someprocess must be responsible for the suppression of star-formation in the mostmassive of galaxies. Commonly Active Galactic Nuclei (AGN) are invoked tofulfil this role, but the exact means by which they do so is still the topic ofmuch debate, with studies finding evidence for both the suppression andenhancement of star-formation in AGN hosts. Using the ZFOURGE and NMBS galaxysurveys, we investigate the host galaxy properties of a mass-limited(M$_{\odot}$ $\ge$ 10$^{10.5}$ M$_{\odot}$), high-luminosity (L$_{1.4}$ $>$10$^{24}$ W Hz$^{-1}$) sample of radio-loud Active Galactic Nuclei to aredshift of z = 2.25. In contrast to low redshift studies, which associateradio-AGN activity with quiescent hosts, we find that the majority of z $>$ 1.5radio-AGN are hosted by star-forming galaxies. Indeed, the stellar populationsof radio-AGN are found to evolve with redshift in a manner that is consistentwith the non-AGN mass-similar galaxy population. Interestingly, we find theradio-AGN fraction is constant across a redshift range of 0.25 $\le$ z $<$2.25, perhaps indicating that the radio-AGN duty cycle has little dependence onredshift or galaxy type. We do however see a strong relation between theradio-AGN fraction and stellar mass, with radio-AGN becoming rare below $\sim$10$^{10.5}$ M$_{\odot}$ or a halo-mass of 10$^{12}$ M$_{\odot}$. This halo-massthreshold is in good agreement with simulations that initiate radio-AGNfeedback at this mass limit. Despite this we find that radio-AGN hoststar-formation rates are consistent with the non-AGN mass-similar galaxysample, suggesting that while radio-AGN are in the right place to suppressstar-formation in massive galaxies they are not necessarily responsible fordoing so.

Radio galaxies in ZFOURGE/NMBS: no difference in the properties of massive galaxies with and without radio-AGN out to z = 2.25