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- W3013500650 abstract "Results of a careful analysis of the absorption sys- tems with zabs'zem seen toward the bright, zem 3.91, gravi- tationally lensed quasar APM 08279+5255 are presented. Two of the narrow-line systems, at zabs = 3.8931 and zabs = 3.9135, show absorptions from singly ionized species with weak or no N v and O vi absorptions at the same red- shift. Absorption due to fine structure transitions of C ii and Siii (excitation energies corresponding to, respectively, 156m and 34m) are detected at zabs = 3.8931. Excitation by IR ra- diation is favored as the column density ratios are consistent with the shape of APM 08279+5255 IR spectrum. The low- ionization state of the system favors a picture where the cloud is closer to the IR source than to the UV source, supporting the idea that the extension of the IR source is larger than 200 pc. The absence of fine structure lines at zabs = 3.9135 suggests that the gas responsible for this system is farther away from the IR source. Abundances are 0.01 and 1 Z at zabs = 3.913 and 3.8931 and aluminum could be over-abundant with respect to silicon and carbon by at least a factor of two and five. All" @default.
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- W3013500650 date "2000-05-01" @default.
- W3013500650 modified "2023-09-23" @default.
- W3013500650 title "Physical conditions in broad and associated narrow absorption-line systems toward APM 08279+5255 ?" @default.
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