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- W3099584823 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)." @default.
- W3099584823 created "2020-11-23" @default.
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- W3099584823 date "2007-11-01" @default.
- W3099584823 modified "2023-10-09" @default.
- W3099584823 title "The Case for Optically Thick High‐Velocity Broad‐Line Region Gas in Active Galactic Nuclei" @default.
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- W3099584823 doi "https://doi.org/10.1086/521290" @default.
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