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

摘要: In order to reproduce the high-mass end of galaxy mass distribution, some process must be responsible for suppression star formation in most massive galaxies. Commonly active galactic nuclei (AGN) are invoked fulfil this role, but exact means by which they do so is still topic much debate, with studies finding evidence both and enhancement AGN hosts. Using ZFOURGE (FourStar Galaxy Evolution) NMBS(Newfirm Medium Band Survey) surveys, we investigate host properties a mass-limited (M >= 10(10.5)M(circle dot)), high-luminosity (L-1.4 > 10(24) W Hz(-1)) sample radio-loud redshift z = 2.25. contrast low-redshift studies, associate radio-AGN activity quiescent hosts, find that majority 1.5 hosted star-forming Indeed, stellar populations found evolve manner consistent non-AGN mass-similar population. Interestingly, fraction constant across range 0.25 < 2.25, perhaps indicating duty cycle has little dependence on or type. We however see strong relation between mass, becoming rare below similar dot) halo 10(12)M(circle dot). This halo-mass threshold good agreement simulations initiate feedback at limit. Despite this, rates sample, suggesting while right place suppress galaxies not necessarily doing so.