Atomic and molecular gas in IllustrisTNG galaxies at low redshift

• Verfasst von: Diemer, Benedikt [VerfasserIn]
• Verfasst von: Stevens, Adam R. H. [VerfasserIn]
• Verfasst von: Lagos, Claudia Del P. [VerfasserIn]
• Verfasst von: Calette, A R [VerfasserIn]
• Verfasst von: Tacchella, Sandro [VerfasserIn]
• Verfasst von: Hernquist, Lars [VerfasserIn]
• Verfasst von: Marinacci, Federico [VerfasserIn]
• Verfasst von: Nelson, Dylan [VerfasserIn]
• Verfasst von: Pillepich, Annalisa [VerfasserIn]
• Verfasst von: Rodriguez-Gomez, Vicente [VerfasserIn]
• Verfasst von: Villaescusa-Navarro, Francisco [VerfasserIn]
• Verfasst von: Vogelsberger, Mark [VerfasserIn]
• Titel: Atomic and molecular gas in IllustrisTNG galaxies at low redshift
• Verf.angabe: Benedikt Diemer, Adam R.H. Stevens, Claudia del P. Lagos, A.R. Calette, Sandro Tacchella, Lars Hernquist, Federico Marinacci, Dylan Nelson, Annalisa Pillepich, Vicente Rodriguez-Gomez, Francisco Villaescusa-Navarro and Mark Vogelsberger
• E-Jahr: 2019
• Jahr: 2019 May 14
• Umfang: 22 S.
• Fussnoten: Gesehen am 28.07.2022
• Titel Quelle: Enthalten in: Royal Astronomical SocietyMonthly notices of the Royal Astronomical Society
• Ort Quelle: Oxford : Oxford Univ. Press, 1827
• Jahr Quelle: 2019
• Band/Heft Quelle: 487(2019), 2, Seite 1529-1550
• ISSN Quelle: 1365-2966
• DOI: doi:10.1093/mnras/stz1323
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1811010199

Abstract

We have recently developed a post-processing framework to estimate the abundance of atomic and molecular hydrogen (H i and H2, respectively) in galaxies in large-volume cosmological simulations. Here we compare the H i and H2 content of IllustrisTNG galaxies to observations. We mostly restrict this comparison to z ≈ 0 and consider six observational metrics: the overall abundance of H i and H2, their mass functions, gas fractions as a function of stellar mass, the correlation between H2 and star formation rate, the spatial distribution of gas, and the correlation between gas content and morphology. We find generally good agreement between simulations and observations, particularly for the gas fractions and the H i mass-size relation. The H2 mass correlates with star formation rate as expected, revealing an almost constant depletion time that evolves up to z = 2 as observed. However, we also discover a number of tensions with varying degrees of significance, including an overestimate of the total neutral gas abundance at z = 0 by about a factor of 2 and a possible excess of satellites with no or very little neutral gas. These conclusions are robust to the modelling of the H i/H2 transition. In terms of their neutral gas properties, the IllustrisTNG simulations represent an enormous improvement over the original Illustris run. All data used in this paper are publicly available as part of the IllustrisTNG data release.