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ABSTRACT
Understanding what shapes the cold gas component of galaxies, which both provides the fuel for star formation and is strongly affected by the subsequent stellar feedback, is a crucial step towards a better understanding of galaxy evolution. Here, we analyse the H i properties of a sample of 46 Milky Way halo-mass galaxies, drawn from cosmological simulations (EMP-Pathfinder and Firebox). This set of simulations comprises galaxies evolved self-consistently across cosmic time with different baryonic sub-grid physics: three different star formation models [constant star formation efficiency (SFE) with different star formation eligibility criteria, and an environmentally dependent, turbulence-based SFE] and two different feedback prescriptions, where only one sub-sample includes early stellar feedback. We use these simulations to assess the impact of different baryonic physics on the H i content of galaxies. We find that the galaxy-wide H i properties agree with each other and with observations. However, differences appear for small-scale properties. The thin H i discs observed in the local universe are only reproduced with a turbulence-dependent SFE and/or early stellar feedback. Furthermore, we find that the morphology of H i discs is particularly sensitive to the different physics models: galaxies simulated with a turbulence-based SFE have discs that are smoother and more rotationally symmetric, compared to those simulated with a constant SFE; galaxies simulated with early stellar feedback have more regular discs than supernova-feedback-only galaxies. We find that the rotational asymmetry of the H i discs depends most strongly on the underlying physics model, making this a promising observable for understanding the physics responsible for shaping the interstellar medium of galaxies.
SEEK ID: https://publications.h-its.org/publications/1883
Research Groups: Astroinformatics
Publication type: Journal
Journal: Monthly Notices of the Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society 531(1):1158-1178
Date Published: 1st Jun 2024
Registered Mode: by DOI
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Gensior, J., Feldmann, R., Reina-Campos, M., Trujillo-Gomez, S., Mayer, L., Keller, B. W., Wetzel, A., Kruijssen, J. M. D., Hopkins, P. F., & Moreno, J. (2024). H i discs of L* galaxies as probes of the baryonic physics of galaxy evolution. In Monthly Notices of the Royal Astronomical Society (Vol. 531, Issue 1, pp. 1158–1178). Oxford University Press (OUP). https://doi.org/10.1093/mnras/stae1217
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Created: 29th Oct 2024 at 12:53
Last updated: 29th Oct 2024 at 12:54
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