The Metallicity evolution of Damped Lyman-alpha systems

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dc.creatorSavaglio, S.
dc.creatorPanagia, N.
dc.creatorStiavelli, M.
dc.date1999-12-06
dc.date2000-04-27
dc.date.accessioned2026-07-07T02:34:48Z
dc.date.available2026-07-07T02:34:48Z
dc.descriptionWe have collected data for 69 Damped Lyman-alpha (DLA) systems, to investigate the chemical evolution of galaxies in the redshift interval 0.0 < z < 4.4. In doing that, we have adopted the most general approach used so far to correct for dust depletion. The best solution, obtained through chi^2 minimization, gives as output parameters the global DLA metallicity and the dust-to-metals ratio. Clear evolution of the metallicity vs. redshift is found (99.99% significance level), with average values going from ~1/30 solar at z~4.1 to ~3/5 solar at z~0.5. We also find that the majority of DLAs (~60%) shows dust depletion patterns which most closely resemble that of the warm halo clouds in the Milky Way, and have dust-to-metals ratios very close to warm halo clouds.
dc.descriptionproceedings of the conference "Cosmic Evolution and Galaxy Formation: Structure, Interactions and Feedback", Puebla, November 1999, ASP. Conf. Series, eds. J. Franco, E. Terlevich., O. Lopez-Cruz, I. Aretxaga. This replaces the paper originally submitted to ApJL. Work is in progress on an extended version
dc.identifierhttps://arxiv.org/abs/astro-ph/9912112
dc.identifierhttp://arxiv.org/abs/astro-ph/9912112
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/15392
dc.subjectAstrophysics
dc.titleThe Metallicity evolution of Damped Lyman-alpha systems
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