Titlebook: QSO Absorption Lines; Proceedings of the E Georges Meylan Conference proceedings 1995 Springer-Verlag Berlin Heidelberg 1995 Absorbing Syst

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Lyman α Emission from Galaxies at High Redshiftse that the Lyman α luminosity of high redshift galaxies is generally less than 10. erg s.. We also present a newly discovered case, in the field of the QSO Q2059–360, where the emission is unusually strong, possibly because the damped system is close in redshift to the QSO.

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Abundances and Ionization in Multiple-Component Absorbers regions consistent with photoionization by hot stars, and higher ionization components that dominate at higher relative velocities. The column densities derived from the N I triplet suggest that [O/H] is depleted by −2.1 dex relative to solar values. Comparison of the predicted vs. observed column

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Element Abundances at High Redshifts: The N/O Ratio at Low Metallicity α systems offer a new approach for tracking the evolution of normal galaxies from early epochs to the present day. Here we report the first measurements of nitrogen abundances in galaxies with less than 1/100 of solar metallicity, a range unexplored by previous observations.

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Chemical Evolution of (Proto-) Galactic Disks and Metal Abundances of Damped Lyα Absorbersundances and element ratios. Our models explicitly account for SNI contributions to .Fe, etc. Comparison with curve of growth determined abundances of metal line systems associated with damped Lyα absorbers shows that

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Abundances and Nature of the Absorbersrved all over the accessible redshift range 0 < . < 5. We therefore need an overall picture describing how the gas evolve. Recent N-body simulations with improved treatment of photoionization and cooling of the baryonic material show that Lymanα clouds could trace the filamentary structures of the dark matter.