Partial Coverage and Time Variability of Narrow-Line Intrinsic QSO Absorption Systems

Details Partial Coverage and Time Variability of Narrow-Line Intrinsic QSO Absorption Systems Partial Coverage and Time Variability of Narrow-Line Intrinsic QSO Absorption Systems

1997-05-07

arxiv.org/abs/astro-ph/9705048v1

Astronomy and Astrophysics

Astrophysics

6 pages with 4 figures, LaTex, to appear in "Mass Ejection From AGN," eds. R.Weymann, I.Shlosman, N.Arav

Scientific paper

It is possible to distinguish ``intrinsic'' absorption systems (gas clouds within the quasar environment) from ``intervening'' systems (gas clouds unrelated to the quasar phenomenon) by considering certain observational properties. We find that the most direct determinations of the intrinsic nature of a system are time variability and partial coverage of the background light source by the absorption region. Both of these conditions are unlikely to occur in intervening systems. We present Keck and HIRES data which demonstrate both these phenomena. We also summarize a list of several other observational properties which appear to be indicative of ``intrinsic'' systems.

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