Kinematics of the Broad Emission Line Region in NGC 5548

Details Kinematics of the Broad Emission Line Region in NGC 5548 Kinematics of the Broad Emission Line Region in NGC 5548

1995-10-19

arxiv.org/abs/astro-ph/9510100v1

Astronomy and Astrophysics

Astrophysics

AASLaTeX file + uuencoded file containing figures

Scientific paper

10.1086/177230

We derive both total flux and velocity-resolved response functions for the CIV 1549 emission line from the data obtained in the 1993 NGC 5548 monitoring campaign. These response functions imply: 1.) the emission region stretches from inside 1 lt-d to outside 10 lt-d, and is probably better described as round than flat; 2.) the velocity field is dominated by a red/blue symmetric component (e.g. 2--d or 3--d random motions, or rotation in a disk) but there is also {\it significant} radial infall. Quantitative modelling indicates that the random speeds are typically a few times as large as the radial speed. However, no simple model gives a completely acceptable fit to the data. These inferences rule out numerous simple and otherwise plausible models for broad line region dynamics, including outflowing winds, radial free-fall, rotation in a disk, or collisionless orbital motion.

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