Accretion and Outflow in Active Galactic Nuclei

Accretion and Outflow in Active Galactic Nuclei - Accretion...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Accretion and Outflow in Active Galactic Nuclei Broad-Absorption-Line QSOs Some QSOs show very broad blueshifted absorption troughs associated with strong UV resonance lines. The type example is PHL 5200, shown in Fig. 1 of Junkkarinen, Burbidge, and Smith 1983 (ApJ 265, 51, ADS by permission of the AAS): The properties of these systems have been reviewed by Weymann, Turnshek, and Christiansen 1984 (in Astrophysics of Active Galaxies and Quasars , p. 333), Weymann and Foltz 1983 (Liege Astrophysical Coll., p. 538), Turnshek 1984 (ApJ 280, 51) and Turnshek 1988 (in QSO Absorption Lines; Probing the Universe , p. 17). Salient features of these spectra include: velocities up to 3 × 10 4 km/s with respect to the emission-line peak occurrence in 3-10% of high-redshift QSOs weak absorption at Lyman α strong absorption in C IV, Si IV, N V, O VI some show absorption from excited states of Fe II some evidence for slightly different emission-line ratios than non-BAL objects QSOs with strong BAL systems are all radio-quiet they are apparently more strongly polarized and more variable than non-BAL QSOs
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 2

Accretion and Outflow in Active Galactic Nuclei - Accretion...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online