Quasar Absorption Lines as a Function of Quasar Orientation Measures

Details Quasar Absorption Lines as a Function of Quasar Orientation Measures Quasar Absorption Lines as a Function of Quasar Orientation Measures

2001-01-04

arxiv.org/abs/astro-ph/0101063v1

February 2001, ApJ, 547, 635

Astronomy and Astrophysics

Astrophysics

34 pages, 7 figures, 3 tables, ApJ in press

Scientific paper

10.1086/318414

We present high resolution radio data at 3.5 and 20 cm from the VLA in the A configuration for 144 quasars with known CIV absorption line properties. Using these measurements, we compare and contrast a number of quasar orientation indicators. These quantities are used to study the velocity distribution of CIV absorption lines as a function of quasar orientation measures. That there is an excess of narrow, high-velocity CIV absorbers in flat-spectrum quasars as compared to steep-spectrum quasars is confirmed. Orientation indicators that are not based upon spectral indices (e.g. R_V and the core-to-lobe ratio) do not show the same effect. These seemingly contradictory results may be reconciled if the absorber distribution is not strictly a function of orientation, but rather a function of intrinsic radio properties that may or may not be good orientation indicators.

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