Deep HI observations of cold gas inflow and outflow
W. J. G. de Blok, D. B. Fisher, K. Tachihara, F. M. Maccagni, J. Wang, R. Enokiya, L. Chemin, T. Hayakawa, D. Kleiner, D. J. Pisano, S. H. Oh
astro-ph.GA
Submitted: 2026-06-26
Comments: Published in Advancing Astrophysics with the SKAII (AASKAII),2026 (arXiv:2606.20366)
License: http://creativecommons.org/licenses/by-nc-sa/4.0/
The gist: A major question in galaxy evolution is how galaxies acquire sufficient gas to sustain their star formation rates.
Terminology
Abstract
A major question in galaxy evolution is how galaxies acquire sufficient gas to sustain their star formation rates. HI observations with high angular resolution and sensitivity to very low column densities are some of the important observational ingredients that are currently still missing. Answers to these questions are necessary for a correct interpretation of observations of galaxy evolution in the high-redshift universe and will provide crucial input for the sub-grid physics in hydrodynamical simulations of galaxy evolutions. In this chapter we discuss the progress that has been made over the past years, describe the various processes that lead to inflow and outflow of gas, and discuss how SKA-Mid AA4 observations can contribute to further understanding these important aspects of galaxy evolution using deep observations of nearby individual disk and dwarf galaxies.
Sources
- Head-tail molecular clouds falling onto the Milky Way disk
- Neutral Atomic Hydrogen Surveys: past, present and future
- The GECKOS Survey: Resolved, multiphase observations of mass-loading and gas density in the galactic wind of NGC 4666
- GECKOS: Turning galaxy evolution on its side with deep observations of edge-on galaxies
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