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We study a sample of 1,604 moderate-to-high radiative luminosity activegalactic nuclei (HLAGN) selected at 3 GHz within the VLA-COSMOS 3 GHz LargeProject. These were classified by combining multiple AGN diagnostics: X-raydata, mid-infrared data and broad-band spectral energy distribution fitting. Wedecompose the total radio 1.4 GHz luminosity ($\mathrm{L_{1.4\ GHz,TOT}}$) intothe emission originating from star formation and AGN activity by measuring theexcess in $\mathrm{L_{1.4\ GHz,TOT}}$ relative to the infrared-radiocorrelation of star-forming galaxies. To quantify the excess, for each sourcewe calculate the AGN fraction ($\mathrm{f_{AGN}}$), the fractional contributionof AGN activity to $\mathrm{L_{1.4\ GHz,TOT}}$. The majority of the HLAGN,$(68.0\pm1.5)\%$, are dominated by star-forming processes ($f_{AGN}\leq0.5$),while $(32.0\pm1.5)\%$ are dominated by AGN-related radio emission($0.5<f_{AGN}\leq1$). We use the AGN-related 1.4 GHz emission to derive the 1.4GHz AGN luminosity functions of HLAGN. By assuming pure density and pureluminosity evolution models we constrain their cosmic evolution out to$z\sim6$, finding $\mathrm{\Phi^* (z) \propto(1+z)^{(2.64\pm0.10)+(-0.61\pm0.04) z}}$ and $\mathrm{L^* (z) \propto(1+z)^{(3.97\pm0.15) + (-0.92\pm0.06)z}}$. These evolutionary laws show thatthe number and luminosity density of HLAGN increased from higher redshifts($z\sim6$) up to a maximum in the redshift range $ 1<z<2.5$, followed by adecline towards local values. By scaling the 1.4 GHz AGN luminosity to kineticluminosity using the standard conversion, we estimate the kinetic luminositydensity as a function of redshift. We compare our result to the semi-analyticmodels of radio mode feedback finding that this feedback could have played animportant role in the context of AGN-host coevolution in HLAGN which showevidence of AGN-related radio emission ($f_{AGN}>0$).

astronomy and astrophysics

The VLA-COSMOS 3 GHz Large Project: Star formation properties and radio  luminosity functions of AGN with moderate-to-high radiative luminosities out  to $z\sim6$