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- W4288045558 abstract "The Ly$alpha$ emission line is one of the main observables of galaxies at high redshift, but its output depends strongly on the neutral gas distribution and kinematics around the star-forming regions where UV photons are produced. We present observations of Ly$alpha$ and 21-cm HI emission at comparable scales with the goal to qualitatively investigate how the neutral interstellar medium (ISM) properties impact Ly$alpha$ transfer in galaxies. We have observed 21-cm HI at the highest angular resolution possible (~ 3 beam) with the VLA in two local galaxies from the Lyman Alpha Reference Sample. We contrast this data with HST Ly$alpha$ imaging and spectroscopy, and MUSE and PMAS ionized gas observations. In LARS08, high intensity Ly$alpha$ emission is co-spatial with high column density HI where dust content is the lowest. The Ly$alpha$ line is strongly redshifted, consistent with velocity redistribution which allows Ly$alpha$ escape from high column density neutral medium with low dust content. In eLARS01, high intensity Ly$alpha$ emission is located in regions of low column density HI, below the HI data sensitivity limit ($<2times10^{20},$cm$^{-2}$). The perturbed ISM distribution with low column density gas in front of the Ly$alpha$ emission region plays an important role in the escape. In both galaxies, the faint Ly$alpha$ emission ($sim 1times10^{-16}$erg.s$^{-1}$cm$^{-2}$arcsec$^{-2}$) traces intermediate H$alpha$ emission regions where HI is found, regardless of the dust content. Dust seems to modulate, but not prevent, the formation of a faint Ly$alpha$ halo. This study suggests the existence of scaling relations between dust, H$alpha$, HI, and Ly$alpha$ emission in galaxies." @default.
- W4288045558 created "2022-07-27" @default.
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- W4288045558 date "2022-07-01" @default.
- W4288045558 modified "2023-09-25" @default.
- W4288045558 title "LARS XIII: High Angular Resolution 21 cm H i Observations of Lyα Emitting Galaxies" @default.
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- W4288045558 doi "https://doi.org/10.3847/1538-4357/ac77ed" @default.
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