ar X iv : a st ro - p h / 00 06 16 5 v 1 1 2 Ju n 20 00 Clues to Quasar Broad Line Region Geometry and Kinematics 1
نویسنده
چکیده
We present evidence that the high-velocity C ivλ1549 emission line gas of radio-loud quasars may originate in a disk-like configuration, in close proximity to the accretion disk often assumed to emit the low-ionization lines. For a sample of 36 radio-loud z ≈2 quasars we find the 20–30% peak width to show significant inverse correlations with the fractional radio core-flux density, R, the radio axis inclination indicator. Highly inclined systems have broader line wings, consistent with a high-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-emitting gas has an inclination independent velocity field. We propose that this low-velocity gas is located at higher disk-altitudes than the high-velocity gas. A planar origin of the high-velocity C iv-emission is consistent with the current results and with an accretion disk-wind emitting the broad lines. A spherical distribution of randomly orbiting broad-line clouds and a polar high-ionization outflow are ruled out. Subject headings: galaxies: active — quasars: emission lines — quasars: geometry
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