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• W2057582805 abstract "We study metal abundances in the z = 0.9313 damped Lyα system observed along the two lines of sight, A and B, toward the gravitationally lensed double QSO HE 0512-3329. Spatially resolved Space Telescope Imaging Spectrograph spectra constrain the neutral-gas column density to be N(H ) = 1020.5 cm-2 in both A and B. UV-visual Echelle Spectrograph spectra (spectral resolution FWHM = 9.8 km s-1) show, in contrast, significant line-of-sight differences in the column densities of Mn II and Fe II; these are not due to observational systematics. We find that [Mn/H] = -1.44 and [Fe/H] = -1.52 in damped Lyα system A, while [Mn/H] = -0.98 and [Fe/H] > -1.32, and possibly as high as [Fe/H] ≈ -1, in damped Lyα system B. A careful assessment of possible systematic errors leads us to conclude that these transverse differences are significant at a 5 σ level or greater. Although nucleosynthesis effects may also be at play, we favor differential dust depletion as the main mechanism producing the observed abundance gradient. The transverse separation is 5 h kpc at the redshift of the absorber, which is also likely to be the lensing galaxy. The derived abundances therefore probe two opposite sides of a single galaxy hosting both damped Lyα systems. This is the first time firm abundance constraints have been obtained for a single damped system probed by two lines of sight. The significance of this finding for the cosmic evolution of metals is discussed." @default.
• W2057582805 created "2016-06-24" @default.
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• W2057582805 date "2005-06-20" @default.
• W2057582805 modified "2023-10-18" @default.
• W2057582805 title "Metal Abundances in a Damped Lyα System along Two Lines of Sight atz= 0.93" @default.
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• W2057582805 doi "https://doi.org/10.1086/429956" @default.
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