Clues to quasar broad-line region geometry and kinematics

We present evidence that the high-velocity C IV lambda 1549 emission-line g as of radio-loud quasars may originate in a disklike configuration, in clos e proximity to the accretion disk often assumed to emit the low-ionization lines. For a sample of 36 radio-loud z approximate to 2 quasars, we find th e 20%-30% peak widths to show significant inverse correlations with the fra ctional radio core-flux density R, which is the radio axis inclination indi cator. Highly inclined systems have broader fine wings, consistent with a h igh-velocity field perpendicular to the radio axis. By contrast, the narrow line core shows no such relation with R, so the lowest velocity C IV-emitt ing gas has an inclination-independent velocity field. We propose that this low-velocity gas is located at higher disk altitudes than the high-velocit y gas. A planar origin of the high-velocity C IV emission is consistent wit h the current results and with an accretion disk wind emitting the broad li nes. A spherical distribution of randomly orbiting broad-line clouds and a polar high-ionization outflow are ruled out.