期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 435, 期 4, 页码 3500-3520出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt1542
关键词
methods: analytical; Supernovae: general; Galaxy: abundances; galaxies: abundances; galaxies: evolution
资金
- Deutsche Forschungsgesellshaft (DFG)
- Science and Technology Facilities Council [ST/I000976/1]
- European Research Council [246797]
- Science and Technology Facilities Council [ST/I000976/1] Funding Source: researchfish
- STFC [ST/I000976/1] Funding Source: UKRI
We update the treatment of chemical evolution in the Munich semi-analytic model, L-Galaxies. Our new implementation includes delayed enrichment from stellar winds, Type II supernovae (SNe-II) and Type Ia supernovae (SNe-Ia), as well as metallicity-dependent yields and a reformulation of the associated supernova feedback. Two different sets of SN-II yields and three different SN-Ia delay-time distributions (DTDs) are considered, and 11 heavy elements (including O, Mg and Fe) are self-consistently tracked. We compare the results of this new implementation with data on (a) local, star-forming galaxies, (b) Milky Way disc G dwarfs and (c) local, elliptical galaxies. We find that the z = 0 gas-phase mass-metallicity relation is very well reproduced for all forms of DTD considered, as is the [Fe/H] distribution in the Milky Way disc. The [O/Fe] distribution in the Milky Way disc is best reproduced when using a DTD with < 50 per cent of SNe-Ia exploding within similar to 400 Myr. Positive slopes in the mass-[alpha/Fe] relations of local ellipticals are also obtained when using a DTD with such a minor 'prompt' component. Alternatively, metal-rich winds that drive light alpha elements directly out into the circumgalactic medium also produce positive slopes for all forms of DTD and SN-II yields considered. Overall, we find that the best model for matching the wide range of observational data considered here should include a power-law SN-Ia DTD, SN-II yields that take account of prior mass-loss through stellar winds and some direct ejection of light alpha elements out of galaxies.
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