Radio-loud Active Galactic Nuclei in the Context of the Eigenvector 1 Parameter Space

We consider the properties of radio-loud (RL) AGN in the context of theEigenvector 1 (E1) parameter space. RL sources show a restricted E1 parameterspace occupation relative to the radio-quiet (RQ) majority. The Fanaroff-RileyII ``parent population'' of relatively un-boosted RL sources (medianradio/optical flux ratio ~490) shows the most restricted occupation. RL sourceshave different broad line properties (and inferred black hole masses andEddington ratios). FWHM H_beta for the broad line component in RL sources areat least twice as large as the RQ majority. The average broad FeII emissionline strength is also about half that for RQ sources. Our sample suggests thatthe RL cutoff occurs near R_k=70 or logP(6cm)=32.0 ergs/s/Hz. Sources belowthis cutoff are RQ although we cannot rule out the existence of a distinctintermediate population. We show that the Doppler boosted core-dominated RLsources (median flux ratio ~1000) lie towards smaller FWHM(H_beta_bc) andstronger FeII in E1 as expected if the lines arise in an accretion disk. Oursubsample of superluminal sources, with orientation inferred from thesynchrotron self Compton model, reinforce this general E1 trend and allow us toestimate the role of source orientation in driving E1 domain occupation.Comment: 9 pages, 3 figures, accepted for publication in ApJ