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

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Abundances and Ionization in Multiple-Component Absorbersthe Zn II / H I ratio provides only a weak upper limit to [Fe/H] for the system. The (S II / Zn II) value implies a strong Fe-peak enhancement relative to .-product elements, compared to Galactic halo stars at [Fe/H] = −2.2. The consequence is that the relative rates of supernovae Type I and Type II may depend on local conditions.

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1431-2433 systems or ejecta from the QSO themselves is settled. QSO absorption line spectroscopy, initially a mere technique, has matured into an essential extragalactic research tool for understanding the content of the Universe at redshifts between 0 and 4, and beyond. The only previous important meeting d

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ESO Astrophysics Symposiahttp://image.papertrans.cn/q/image/780022.jpg

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QSO Absorption by Nearby Galaxiesl views highlighted by the recent NATO conference on the opacity of spiral disks. We find that a significant amount of the universe will be obscured at redshifts important to QSO astronomers. This implies that any studies at high redshift should take account of this absorption.

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High Redshift Lyman Limit and Damped Lyman-Alpha Absorbersed to create new samples of high redshift Lyman-limit and damped Lyman-a absorbers. These data have been combined with published data sets in a study of the redshift evolution and the column density distribution function for absorbers with logN(HI)≥ 17.5, over the redshift range 0.01 < z < 5. The main results are:

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