Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21011301g&link_type=abstract
American Astronomical Society Meeting 210, #113.01; Bulletin of the American Astronomical Society, Vol. 39, p.237
Astronomy and Astrophysics
Astronomy
Scientific paper
Broad absorption line (BAL) quasars exhibit broad line aborption in their ultraviolet spectra at outflow velocities up to or even exceeding 0.1c. We compare recently-obtained quasar spectra to those in the Large Bright Quasar Survey (LBQS) to study the variation of BAL quasars over system-frame time scales up to about 10 years. Absorption features in the approximately 20 BAL quasars in our study vary notably over these time scales. BAL trough variation is complex, occurring in both narrower and broad velocity components over a wide range of outflow velocities. Comparing absorption from lines of multiple ions allows us to constrain the ionization structure and elemental abundances in the outflow. BAL quasar models must account for small-scale structures which can vary on <10 year time scales along our line of sight. Additional optical and X-ray observations of BAL quasars will greatly improve our understanding of the structure of the ionized absorbers in AGNs.
Brandt Niel
Fang Junsheng
Gallagher Sarah
Gibson Robert
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