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- W122754811 abstract "While it is widely held that the densities of QSO and Seyfert broad-line regions lie below 10 11 cm −3 , there is a growing body of evidence, indicating that at least some of the broad-line gas has densities equal to or exceeding 10 11 cm −3 . Such evidence includes (1) the presence of a 3μm “bump” in roughly half of all QSOs, (2) the depression of Brγ in several Seyfert galaxies, (3) the broad-line variablity in some objects, and (4) the ability to produce the hydrogen spectrum theoretically." @default.
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- W122754811 date "1986-01-01" @default.
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- W122754811 title "High densities in QSO and seyfert broad-line clouds" @default.
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- W122754811 doi "https://doi.org/10.1017/s0074180900152945" @default.
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