Properties of the broad absorption-line QSOs

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Absorption Spectra, Astronomical Spectroscopy, Quasars, Emission Spectra, Ionization, Optical Polarization, Radio Spectra, X Ray Spectra

Scientific paper

The observed properties of the broad absorption-line (BAL) QSOs which are largely independent of interpretation are presented. About 3-10 percent of the moderate-to-high redshift QSOs have BALs. A variety of structure was exhibited in the absorption troughs, with outflow velocities near 65,000 km/s reported, though 0-20,000 km/s is more typical. For solar abundances and conservative assumptions concerning the amount of C(3+) with respect to carbon, the total deduced minimum column densities are between 10 to the 20th and 10 to the 21st/sq cm. The C IV emission lines in BAL QSOs had generally smaller peak intensities relative to the continuum when compared with non-BAL QSOs.

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