* Astronomy

Title: 3C 216: A Powerful FRII Seyfert 1 Galaxy
Authors: Brian Punsly

3C 216 has a weak accretion flow luminosity, well below the Seyfert1/QSO dividing line, weak broad emission lines (BELs) and powerful radio lobes. As a consequence of the extreme properties of 3C 216, it is the most convincing example known of an FR II radio source that is kinetically dominated: the jet kinetic luminosity, Q, is larger than the total thermal luminosity (IR to X-ray) of the accretion flow, Lbol. Using three independent estimators for the central black hole mass, we find that the jet in 3C 216 is very super-Eddington, 3.3 LEdd< bar Q< 10 LEdd, where bar Q is the long term time averaged Q(t), calculated at 151 MHz. It is argued that 3C 216 satisfies the contemporaneous kinetically dominated condition, R(t) is equivalent to Q(t)/Lbol(t)>1, either presently or in the past based on the rarity of Lbol>LEdd quasars. The existence of R(t)>1 AGN is a strong constraint on the theory of the central engine of FRII radio sources.

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-- Edited by Blobrana at 11:13, 2006-09-08