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Quasar Absorption Lines as a Function of Quasar Orientation Measures
Journal article   Open access

Quasar Absorption Lines as a Function of Quasar Orientation Measures

Gordon T Richards, S. A Laurent-Muehleisen, Robert H Becker and Donald G York
The Astrophysical journal, v 547(2), pp 635-648
04 Jan 2001
DOI: https://doi.org/10.1086/318414
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https://doi.org/10.1086/318414View
Published, Version of Record (VoR)Maybe Open Access (Publisher Bronze),  Open

Abstract

Physics - Astrophysics of Galaxies Physics - Cosmology and Nongalactic Astrophysics Physics - Earth and Planetary Astrophysics Physics - High Energy Astrophysical Phenomena Physics - Instrumentation and Methods for Astrophysics Physics - Solar and Stellar Astrophysics
February 2001, ApJ, 547, 635 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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Astronomy & Astrophysics
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