Galactic Constraints on Supernova Progenitor Models

Abstract

We undertake a statistical analysis of the radial abundance distributions in the Galactic disk within a theoretical framework for Galactic chemical evolution which incorporates the influence of spiral arms. 1) The mean mass of oxygen ejected per core-collapse SNe (CC SNe) event (which are concentrated within spiral arms) is $\sim$0.27 M${}_{\odot }$; 2) the mean mass of iron ejected by `tardy' Type Ia SNe (SNeIa; progenitors of whom are older/longer-lived stars with ages $\simgt$100 Myr and up to several Gyr, which do not concentrate within spiral arms) is $\sim$0.58 M${}_{\odot }$; 3) the upper mass of iron ejected by prompt SNeIa (SNe whose progenitors are younger/shorter-lived stars with ages $\simlt$100 Myr, which are concentrated within spiral arms) is $\le$0.23 M${}_{\odot }$ per event; 4) the corresponding mean mass of iron produced by CC SNe is $\le$0.04 M${}_{\odot }$ per event; (v) short-lived SNe (core-collapse or prompt SNeIa) supply $\sim$85% of the Galactic disk's iron. The inferred low mean mass of oxygen ejected per CC SNe event implies a low upper mass limit for the corresponding progenitors of $\sim$23 M${}_{\odot }$, otherwise the Galactic disk would be overabundant in oxygen. The low mean mass of iron ejected by prompt SNeIa, relative to the mass produced by tardy SNeIa ($\sim$2.5 times lower), prejudices the idea that both sub-populations of SNeIa have the same physical nature. We suggest that, perhaps, prompt SNeIa are more akin to CC SNe, and discuss the implications of such a suggestion.

10 pages, 5 figures

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• VLT/UVES observations of peculiar alpha abundances in a sub-DLA at z ~ 1.8 towards the quasar B1101-26
• Investigation of the Prompt SNe Ia progenitor nature through the analysis of the chemical composition of globular clusters and circumgalactic clouds
• On the relationship between metallicity distributions of globular clusters and of circumgalactic gas
• Local metallicity distribution function derived from Galactic large-scale radial iron pattern modelling
• Indicatives of Early Stages of Star Formation in the Universe