Supernova-driven Turbulent Metal Mixing in High-redshift Galactic Disks: Metallicity Fluctuations in the Interstellar Medium and its Imprints on Metal-poor Stars in the Milky Way
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Supernova-driven Turbulent Metal Mixing in High-redshift Galactic Disks : Metallicity Fluctuations in the Interstellar Medium and its Imprints on Metal-poor Stars in the Milky Way. / Kolborg, Anne Noer; Martizzi, Davide; Ramirez-Ruiz, Enrico; Pfister, Hugo; Sakari, Charli; Wechsler, Risa H.; Soares-Furtado, Melinda.
I: Astrophysical Journal Letters, Bind 936, Nr. 2, 26, 01.09.2022.Publikation: Bidrag til tidsskrift › Letter › Forskning › fagfællebedømt
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TY - JOUR
T1 - Supernova-driven Turbulent Metal Mixing in High-redshift Galactic Disks
T2 - Metallicity Fluctuations in the Interstellar Medium and its Imprints on Metal-poor Stars in the Milky Way
AU - Kolborg, Anne Noer
AU - Martizzi, Davide
AU - Ramirez-Ruiz, Enrico
AU - Pfister, Hugo
AU - Sakari, Charli
AU - Wechsler, Risa H.
AU - Soares-Furtado, Melinda
PY - 2022/9/1
Y1 - 2022/9/1
N2 - The extent to which turbulence mixes gas in the face of recurrent infusions of fresh metals by supernovae (SN) could help provide important constraints on the local star formation conditions. This includes predictions of the metallicity dispersion among metal-poor stars, which suggests that the interstellar medium was not very well mixed at these early times. The purpose of this Letter is to help isolate, via a series of numerical experiments, some of the key processes that regulate turbulent mixing of SN elements in galactic disks. We study the gas interactions in small simulated patches of a galaxy disk with the goal of resolving the small-scale mixing effects of metals at parsec scales, which enables us to measure the turbulent diffusion coefficient in various galaxy environments. By investigating the statistics of variations of alpha elements in these simulations, we are able to derive constraints not only on the allowed range of intrinsic yield variations in SN explosions but also on the star formation history of the Milky Way. We argue that the observed dispersion of [Mg/Fe] in metal-poor halo stars is compatible with the star-forming conditions expected in dwarf satellites or in an early low-star-forming Milky Way progenitor. In particular, metal variations in stars that have not been phase-mixed can be used to infer the star-forming conditions of disrupted dwarf satellites.
AB - The extent to which turbulence mixes gas in the face of recurrent infusions of fresh metals by supernovae (SN) could help provide important constraints on the local star formation conditions. This includes predictions of the metallicity dispersion among metal-poor stars, which suggests that the interstellar medium was not very well mixed at these early times. The purpose of this Letter is to help isolate, via a series of numerical experiments, some of the key processes that regulate turbulent mixing of SN elements in galactic disks. We study the gas interactions in small simulated patches of a galaxy disk with the goal of resolving the small-scale mixing effects of metals at parsec scales, which enables us to measure the turbulent diffusion coefficient in various galaxy environments. By investigating the statistics of variations of alpha elements in these simulations, we are able to derive constraints not only on the allowed range of intrinsic yield variations in SN explosions but also on the star formation history of the Milky Way. We argue that the observed dispersion of [Mg/Fe] in metal-poor halo stars is compatible with the star-forming conditions expected in dwarf satellites or in an early low-star-forming Milky Way progenitor. In particular, metal variations in stars that have not been phase-mixed can be used to infer the star-forming conditions of disrupted dwarf satellites.
KW - CHEMICAL EVOLUTION
KW - GALAXY FORMATION
KW - DWARF GALAXIES
KW - ENRICHMENT
KW - FEEDBACK
KW - SUBSTRUCTURE
KW - SIMULATIONS
KW - STATISTICS
KW - ABUNDANCES
KW - CARBON
U2 - 10.3847/2041-8213/ac8c98
DO - 10.3847/2041-8213/ac8c98
M3 - Letter
VL - 936
JO - The Astrophysical Journal Letters
JF - The Astrophysical Journal Letters
SN - 2041-8205
IS - 2
M1 - 26
ER -
ID: 319779635