The Fundamental Plane Evolution of Active Galactic Nucleus Host Galaxies

We measured the stellar velocity dispersions of 15 active galactic nucleus(AGN) host galaxies at redshifts as high as $\sim 0.34$. Combining these withpublished velocity dispersion measurements from the literature, we study theFundamental Plane of AGN host galaxies and its evolution. BL Lac hosts andradio galaxies seem to lie on the same Fundamental Plane as normal early-typegalaxies. The evolution of the mass-to-light ratio of AGN host galaxies shows asimilar trend to that observed in normal early-type galaxies, consistent withsingle-burst passive evolution models with formation redshifts $z \gtrsim 1$.The lack of a significant difference between normal and AGN host galaxies inthe Fundamental plane supports the "Grand Unification" picture wherein AGNs area transient phase in the evolution of normal galaxies. The black hole masses ofBL Lac objects and radio galaxies, derived using the mass -- dispersionrelation, are similar. The black hole mass is independent of BL Lac type. Thelocal black hole mass -- host galaxy luminosity relation of our sub-sample at$z < 0.1$ is similar to that of local normal and radio galaxies, but is lesswell defined at higher redshift due to the luminosity evolution of the hostgalaxies.Comment: 19pages, 8 color figures, accepted for publication in Ap