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arXiv:astro-ph/0402508 (astro-ph)
[Submitted on 21 Feb 2004]

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

Authors:Stephanie A. Snedden, C. Martin Gaskell
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Abstract: 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).
Comments: 34 pages in AASTeX, including 10 pages of figures. Submitted to Astrophysical Journal
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0402508
  (or arXiv:astro-ph/0402508v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0402508
Related DOI: https://doi.org/10.1086/521290

Submission history

From: Stephanie Snedden [view email]
[v1] Sat, 21 Feb 2004 06:12:38 UTC (132 KB)
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