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We analyze the optical spectra of massive (log M*/Msun > 11.4) radio-loudgalaxies at z~0.2 and z~0.6. By comparing stellar population parameters ofthese radio-loud samples with radio-quiet control samples, we investigate howthe presence of a radio-emitting jet relates to the recent star formationhistory of the host galaxy. We also investigate how the emission-lineproperties of the radio galaxies evolve with redshift by stacking theirspectra. Our main results are the following. (1) Both at low and at highredshift, half as many radio-loud as radio-quiet galaxies have experiencedsignificant star formation in the past Gyr. (2) The Balmer absorption lineproperties of massive galaxies that have experienced recent star formation showthat star formation occurred as a burst in many of these systems. (3) Both theradio and the emission-line luminosity of radio AGN evolve significantly withredshift. However, radio galaxies with similar stellar population parameters,have similar emission-line properties both at high- and at low-redshift. Theseresults suggest that massive galaxies experience cyclical episodes of gasaccretion, star formation and black hole growth, followed by the production ofa radio jet that shuts down further activity. The behaviour of galaxies withlog M*/Msun > 11.4 is the same at z = 0.6 as it is at z = 0.2, except thathigher redshift galaxies experience more star formation and black hole growthand produce more luminous radio jets during each accretion cycle.

Evolution of the Most Massive Galaxies to z ~ 0.6: II. The link between radio AGN activity and star formation