2012/02/15 by Chiaki Kobayashi, Kobayashi, Chiaki
Physics and Astronomy · #Astronomy and Astrophysical Research #Stellar, planetary, and galactic studies #Gamma-ray bursts and supernovae
paper · pdf · doi:10.48550/arxiv.1202.3356
Elemental and isotopic abundances are the fossils of galactic archaeology. The observed [X/Fe]-[Fe/H] relations in the Galactic bulge and disk and the mass-metallicity relation of galaxies are roughly reproduced with chemodynamical simulations of galaxies under the standard Λ-CDM picture and standard stellar physics. The isotopic ratios such as 17,18O and 25,26Mg may require a refinement of modelling of supernova and asymptotic giant branch stars. The recent observation of the Carbon-rich damped Lyman αsystem can be reproduced only with faint core-collapse supernovae. This suggests that chemical enrichment by the first stars in the first galaxies is driven not by pair-instability supernovae but by core-collapse supernovae (∼ 20-50M_\odot). The observed F abundances can be reproduced with the neutrino processes of core-collapse supernovae. As in F, the observations of elemental abundances in small systems may requires further complications of chemical enrichment. In globular clusters the relative contribution from low-mass supernovae is likely to be smaller than in the field, while the contribution from massive supernovae seems smaller in dwarf spheroidal galaxies than in the solar neighbourhood.