The Level of Ionization and Chemical Composition of QSO BAL Regions

Details The Level of Ionization and Chemical Composition of QSO BAL Regions The Level of Ionization and Chemical Composition of QSO BAL Regions

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.4805k&link_type=abstract

American Astronomical Society, 180th AAS Meeting, #48.05; Bulletin of the American Astronomical Society, Vol. 24, p.807

Astronomy and Astrophysics

Astronomy

Scientific paper

We present results from our attempts to understand the level of ionization and chemical composition of the Broad Absorption Line (BAL) regions of QSOs. We discuss three aspects of the work: 1) We consider methods used to derive BAL region column densities as a function of outflow velocity from BAL profiles, discussing the problems associated with making assumptions about BAL region cloud sizes, covering factors, and internal kinematics (thermal versus turbulent velocities). 2) We apply these methods to a study of the ionization and chemical composition of QSO BAL regions using Ferland's photoionization code CLOUDY. 3) We present results for several BAL QSOs in our study, taking advantage of the presence of absorption from different ions of the same element to derive photoionization parameters. This allows us to derive more stringent constraints than has been possible in the past.

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