Clues to Quasar Broad Line Region Geometry and Kinematics

Details Clues to Quasar Broad Line Region Geometry and Kinematics Clues to Quasar Broad Line Region Geometry and Kinematics

2000-06-12

arxiv.org/abs/astro-ph/0006165v1

Astronomy and Astrophysics

Astrophysics

5 Latex pages, 1 figure, accepted for publication in ApJ Letters

Scientific paper

10.1086/312805

We present evidence that the high-velocity CIV lambda 1549 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 CIV-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 CIV-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.

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