Progenitor-mass-dependent yields amplify intrinsic scatter in dwarf-galaxy elemental abundance ratios
| Autor: | Andrew Emerick, Coral Wheeler, Dušan Kereš, Dhruv Muley, Andrew Wetzel, Philip F. Hopkins |
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| Rok vydání: | 2020 |
| Předmět: |
astro-ph.SR
dwarf [galaxies] Stellar population Metallicity astro-ph.GA FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astronomy & Astrophysics 01 natural sciences Abundance (ecology) abundances [galaxies] 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Ejecta 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) evolution [galaxies] Astrophysics::Galaxy Astrophysics Dwarf galaxy Physics 010308 nuclear & particles physics Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies Supernova Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Production (computer science) Astronomical and Space Sciences |
| Zdroj: | Monthly Notices of the Royal Astronomical Society, vol 508, iss 1 |
| Popis: | In hydrodynamic simulations, prevailing subgrid chemical-evolution models often use a single, "IMF-averaged" supernova yield, ignoring variations in elemental abundance ratios (particularly [$\alpha$/Fe]) in the ejecta of higher- and lower-mass supernova progenitors within a stellar population. To understand the impact of this simplification and understand the impact of more explicit models, we run FIRE simulations of a dwarf galaxy $(M_\star($z = 0$) \sim 10^6 M_\odot)$ using nucleosynthetic yields from the NuGrid database that depend on the stellar progenitor mass and metallicity. While NuGrid exhibits lower aggregate $\alpha$-element production than default-FIRE yields, we find that its explicit mass dependence substantially widens the intrinsic scatter in the simulated [Fe/H]-[$\alpha$/Fe] -- a phenomenon potentially visible in recent observations of dwarf galaxies. Comment: MNRAS accepted. 9 pages; 8 figures. Comments and questions welcome |
| Databáze: | OpenAIRE |
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