The Role of Sub–Damped Lyα Absorbers in the Cosmic Evolution of Metals

Autor:	Varsha P. Kulkarni, Joseph D. Meiring, James T. Lauroesch, Celine Peroux, Pushpa Khare, Donald G. York
Rok vydání:	2007
Předmět:	Physics Sample selection COSMIC cancer database 010308 nuclear & particles physics Metallicity Astronomy and Astrophysics Quasar Astrophysics 01 natural sciences Redshift Galaxy Physical cosmology Chemical evolution Space and Planetary Science 0103 physical sciences 010303 astronomy & astrophysics
Zdroj:	The Astrophysical Journal. 661:88-94
ISSN:	1538-4357 0004-637X
DOI:	10.1086/515430
Popis:	Observations of low mean metallicity of damped Lyman-alpha (DLA) quasar absorbers at all redshifts studied appear to contradict the predictions for the global mean interstellar metallicity in galaxies from cosmic chemical evolution models. On the other hand, a number of metal-rich sub-DLA systems have been identified recently, and the fraction of metal-rich sub-DLAs appears to be considerably larger than that of metal-rich DLAs, especially at z < 1.5. In view of this, here we investigate the evolution of metallicity in sub-DLAs. We find that the mean Zn metallicity of the observed sub-DLAs may be higher than that of the observed DLAs, especially at low redshifts, reaching a near-solar level at z
Databáze:	OpenAIRE
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