期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 496, 期 1, 页码 80-94出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa1451
关键词
stars: abundances; ISM: abundances; galaxies: abundances; galaxies: evolution
资金
- Center for Cosmology and AstroParticle Physics at The Ohio State University
- United Kingdom Science and Technology Facility Council (STFC) [ST/R000905/1]
- BIS National E-infrastructure capital grant [ST/K00042X/1]
- DiRAC Operations grant [ST/K003267/1]
- STFC capital grant [ST/K00087X/1]
- Durham University
- Alfred P. Sloan Foundation
- U.S. Department of Energy Office of Science
- Brazilian Participation Group
- Carnegie Institution for Science
- Carnegie Mellon University
- Chilean Participation Group
- French Participation Group
- Harvard-Smithsonian Center for Astrophysics
- Instituto de Astrofisica de Canarias
- The Johns Hopkins University
- Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo
- Korean Participation Group
- Lawrence Berkeley National Laboratory
- Leibniz Institut fur Astrophysik Potsdam (AIP)
- Max-Planck-Institut fur Astronomie (MPIA Heidelberg)
- Max-Planck-Institut fur Astrophysik (MPA Garching)
- Max-Planck-Institut fur Extraterrestrische Physik (MPE)
- National Astronomical Observatories of China
- New Mexico State University
- New York University
- University of Notre Dame
- Observatario Nacional/MCTI
- Ohio State University
- Pennsylvania State University
- Shanghai Astronomical Observatory
- United Kingdom Participation Group
- Universidad Nacional Autonoma de Mexico
- University of Arizona
- University of Colorado Boulder
- University of Oxford
- University of Portsmouth
- University of Utah
- University of Virginia
- University of Washington
- University of Wisconsin
- Vanderbilt University
- Yale University
- STFC [ST/P002447/1, ST/P000673/1, ST/J005673/1, ST/T001550/1, ST/L000636/1, ST/T001348/1, ST/T001569/1, ST/M000958/1, ST/R001014/1, ST/P003400/1, ST/V002384/1, ST/V002376/1, ST/M006948/1, ST/M007073/1, ST/S003916/1, ST/S003762/1, ST/M007006/1, ST/M007065/1, ST/T001372/1, ST/R00689X/1, ST/K00333X/1, ST/K00042X/1, ST/R000832/1, ST/H008519/1, ST/V002635/1, ST/R000905/1, ST/T00049X/1, ST/M007618/1, ST/R001049/1] Funding Source: UKRI
In order to understand the roles of metal flows in galaxy formation and evolution, we analyse our self-consistent cosmological chemodynamical simulation of a Milky Way like galaxy during its thin-disc phase. Our simulated galaxy disc qualitatively reproduces the variation of the dichotomy in [alpha/Fe]Fe/H] at different Galactocentric distances as derived by APOGEE-DR16, as well as the stellar age distribution in [alpha/Fe]-[Fe/H] from APOKASC-2. The disc grows from the inside out, with a radial gradient in the star-formation rate during the entire phase. Despite the radial dependence, the outflow-to-in fall ratio of metals in our simulated halo shows a time-independent profile scaling with the disc growth. The simulated disc undergoes two modes of gas inflow: (i) an infall of metal-poor and relatively low-[alpha/Fe] gas, and (ii) a radial flow where already chemically enriched gas moves inwards with an average velocity of similar to 0.7 km s(-1). Moreover, we find that stellar migrations mostly happen outwards, on typical time-scales of similar to 5 Gyr. Our predicted radial metallicity gradients agree with the observations from APOGEE-DR16, and the main effect of stellar migrations is to flatten the radial metallicity profiles by 0.05 dex/kpc in the slopes. We also show that the effect of migrations can appear more important in [alpha/Fe] than in the [Fe/H]-age relation of thin-disc stars.
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