Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..582d&link_type=abstract
In: Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 J
Astronomy and Astrophysics
Astronomy
Damped Lyman-Alpha Systems
Scientific paper
By combining new UVES-VLT spectra with the existing Keck-HIRES spectra we covered the total optical spectral range for four quasars and measured the column densities of 21 ions namely 14 elements in each of their intervening DLAs. Giving the high quality of the data we could undertake a detailed study of the DLA component-to-component abundances to see whether we detect variations due to different dust contents ionization levels and/or chemical compositions within the objects as observed in our Galaxy. The large amount of information allowed us to constrain in the studied DLAs the dust depletion and the ionization effects. We had in this way access to the intrinsic chemical abundances thanks to which we could undertake a determination of the star formation history and the nature for each system individually and not as usually done for the sample of all DLAs as a whole. The large number of different abundance ratios we had at disposal allowed us to make a detailed comparison with the chemical evolution models of Calura Matteucci & Vladilo (2003) and constrain the star formation history the morphological type as well as the formation epoch of the studied DLAs.
Calura Francesco
D'Odorico Sandro
Dessauges-Zavadsky Miroslava
Matteucci Francesca
Prochaska Jason Xavier
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