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- W2111143085 abstract "We estimate the potential contribution of M < 10^9 Msun dwarf galaxies to the reionization and early metal-enrichment of the Milky Way environment, or circum-Galactic Medium. Our approach is to use the observed properties of ancient stars (> 12 Gyr old) measured in nearby dwarf galaxies to characterize the star-formation at high-z. We use a merger-tree model for the build-up of the Milky Way, which self-consistently accounts for feedback processes, and which is calibrated to match the present-day properties of the Galaxy and its dwarf satellites. We show that the high-z analogues of nearby dwarf galaxies can produce the bulk of ionizing radiation (>80%) required to reionize the Milky Way environment. Our fiducial model shows that the gaseous environment can be 50% reionized at z ~ 8 by galaxies with 10^7 Msun < M < 10^8 Msun. At later times, radiative feedback stops the star-formation in these small systems, and reionization is completed by more massive dwarf galaxies by z_rei = 6.4pm 0.5. The metals ejected by supernova-driven outflows from M < 10^9 Msun dwarf galaxies almost uniformly fill the Milky Way environment by z ~ 5, enriching it to Z ~ 2 10^-2 Zsun. At z ~ 2 these early metals are still found to represent ~ 50% of the total mass of heavy elements in the circum-Galactic Medium." @default.
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- W2111143085 date "2013-10-16" @default.
- W2111143085 modified "2023-09-30" @default.
- W2111143085 title "Metals and ionizing photons from dwarf galaxies" @default.
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- W2111143085 doi "https://doi.org/10.1093/mnrasl/slt132" @default.
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