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2001ApJ...547..635R - Astrophys. J., 547, 635-648 (2001/February-1)

Quasar absorption lines as a function of quasar orientation measures.

RICHARDS G.T., LAURENT-MUEHLEISEN S.A., BECKER R.H. and YORK D.G.

Abstract (from CDS):

We present high-resolution radio data at 3.5 and 20 cm from the VLA in the A configuration for 144 quasars with known C IV 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 C IV absorption lines as a function of quasar orientation measures. That there is an excess of narrow, high-velocity C IV absorbers in flat spectrum quasars as compared to steep spectrum quasars is confirmed. Orientation indicators that are not based upon spectral indices (e.g., RV 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.

Abstract Copyright:

Journal keyword(s): Galaxies: Intergalactic Medium - Galaxies: Quasars: Absorption Lines - Radio Continuum: Galaxies

Simbad objects: 146

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