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• W2057953757 abstract "We find that the depth and shape of the broad absorption lines (BALs) in BALQSO 1603+3002 are determined largely by the fraction of the emitting source which is covered by the BAL flow. In addition, the observed depth of the BALs is poorly correlated with their real optical depth. The implication of this result is that abundance studies based on direct extraction of column densities from the depth of the absorption troughs are unreliable. Our conclusion is based on analysis of unblended absorption features of two lines from the same ion (in this case the Si IV doublet), which allows unambiguous separation of covering factor and optical depth effects. The complex morphology of the covering factor as a function of velocity suggests that the BALs are produced by several physically separated outflows. The covering factor is ion dependent in both depth and velocity width. We also find evidence that in BALQSO 1603+3002 the flow does not cover the broad emission line region." @default.
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• W2057953757 date "1999-10-20" @default.
• W2057953757 modified "2023-09-25" @default.
• W2057953757 title "What Determines the Depth of Broad Absorption Lines? Keck HIRES Observations of BALQSO 1603+3002" @default.
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• W2057953757 doi "https://doi.org/10.1086/307841" @default.
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