On the AGN radio luminosity distribution and the black hole fundamental plane

We have studied the dependence of the AGN nuclear radio luminosity on both the AGN X-ray and the host-galaxy K-band luminosity. A complete sample of about 1300 (radio observed) X-ray selected AGNs has been used. At variance with previous studies, radio upper limits have been taken into account. The intrinsic AGN radio luminosity distribution, and its dependence on X-ray and K-band luminosities, has been derived. Using scale relations between the BH masses and the host galaxy K-band luminosity, we have been able to derive a new estimate of the BH fundamental plane (in the L[1.4GHz]-L[2-10keV]-M[BH] space). Our analysis shows that previous measures of the BH fundamental plane are biased in favor of the most luminous radio sources and, therefore, many AGN/galaxy co-evolution models, where radio-feedback is assumed, should revise their predictions.