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Article overview
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Constraints on Early Nucleosynthesis from the Abundance Pattern of a Damped Ly-alpha System at z = 2.626 | Yeshe Fenner
; Jason X. Prochaska
; Brad K. Gibson
; | Date: |
21 Dec 2003 | Journal: | Astrophys.J. 606 (2004) 116-125 | Subject: | astro-ph | Affiliation: | 1 and 2), Jason X. Prochaska , Brad K. Gibson ( Swinburne University, UCO/Lick Observatory | Abstract: | We have investigated chemical evolution in the young universe by analysing the detailed chemical enrichment pattern of a metal-rich galaxy at high redshift. The recent detection of over 20 elements in the gas-phase of a damped Lyman-alpha absorber (DLA) at z = 2.626 represents an exciting new avenue for exploring early nucleosynthesis. Given a strict upper age of ~2.5 Gyr and a gas-phase metallicity about one third solar, we have shown the DLA abundance pattern to be consistent with the predictions of a chemical evolution model in which the interstellar enrichment is dominated by massive stars with a small contribution from Type Ia supernovae. Discrepancies between the empirical data and the models are used to highlight outstanding issues in nucleosynthesis theory, including a tendency for Type II supernovae models to overestimate the magnitude of the "odd-even" effect at subsolar metallicities. Our results suggest a possible need for supplemental sources of magnesium and zinc, beyond that provided by massive stars. | Source: | arXiv, astro-ph/0401413 | Services: | Forum | Review | PDF | Favorites |
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