The Case for Optically-Thick High Velocity Broad Line Region Gas in Active Galactic Nuclei

Details The Case for Optically-Thick High Velocity Broad Line Region Gas in Active Galactic Nuclei The Case for Optically-Thick High Velocity Broad Line Region Gas in Active Galactic Nuclei

2004-02-21

arxiv.org/abs/astro-ph/0402508v1

Astronomy and Astrophysics

Astrophysics

34 pages in AASTeX, including 10 pages of figures. Submitted to Astrophysical Journal

Scientific paper

A combined analysis of the profiles of the main broad quasar emission lines in both Hubble Space Telescope and optical spectra shows that while the profiles of the strong UV lines are quite similar, there is frequently a strong increase in the Ly-alpha/H-alpha ratio in the high-velocity gas. We show that the suggestion that the high velocity gas is optically-thin presents many problems. We show that the relative strengths of the high velocity wings arise naturally in an optically-thick BLR component. An optically-thick model successfully explains the equivalent widths of the lines, the Ly-alpha/H-alpha ratios and flatter Balmer decrements in the line wings, the strengths of CIII] and the lambda 1400 blend, and the strong variability of high-velocity, high-ionization lines (especially HeII and HeI).

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