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Escape of LyC and LyA photons from magnetized GMCs
Understanding the escape of Lyman continuum and Lyman alpha photons from giant molecular clouds is crucial to study the reionization of the Universe and to interpret spectra of observed galaxies at high redshift. To this end, we perform high-resolution, radiation-magneto-hydrodynamic simulations of GMCs using RAMSES, with self-consistent star formation and stellar feedback. (Kimm, Bieri, Geen+2021)
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RAM pressure stripping of a turbulent galaxy
We investigate the impact of ram pressure stripping due to the ICM on star-forming disk galaxies with a multi-phase ISM maintained by strong stellar feedback using radiation-hydrodynamics simulations of an isolated disk galaxy. We find that both star formation quenching and triggering occur in ram pressure-stripped galaxies, depending on the strength of the winds. Turbulent pressure provides support against ram pressure in the central region where star formation is active. However, little star formation is observed in the extraplanar region, indicating that the formation of jellyfish galaxies may require unusual conditions such as a large amount of gas in the disk. (Lee, Kimm, Katz+ 2020)
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Origin of low LyC escape in LBGs: metallicity
The escape fraction of LyC photons from massive galaxies at z=3-4 (Lyman break galaxies) is often lower than that of galaxies during the epoch of reionization. We investigate the physical origin of the low escape fraction using radiation-hydrodynamic simulations. We find that high metallicity of the massive galaxies is primarily responsible for the low escape fraction in LBGs as young stars are enshrouded by dense gas clumps for a longer period of time. This provides a natural explanation for the negative dependence of escape fractions on dark matter halo mass, as is required to complete reionization by z~6 (Yoo, Kimm, Rosdahl 2020)