Atomic and molecular gas in IllustrisTNG galaxies at low redshift

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, Mark Vogelsberger

Research output: Contribution to journalArticle

Abstract

We have recently developed a post-processing framework to estimate the abundance of atomic and molecular hydrogen (H I and H-2, respectively) in galaxies in large-volume cosmological simulations. Here we compare the HI and H-2 content of IllustrisTNG galaxies to observations. We mostly restrict this comparison to z approximate to 0 and consider six observational metrics: the overall abundance of HI and H-2, their mass functions, gas fractions as a function of stellar mass, the correlation between H-2 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 HI mass-size relation. The H-2 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 HI/H-2 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.

Original languageEnglish
Pages (from-to)1529-1550
Number of pages22
JournalMonthly Notices of the Royal Astronomical Society
Volume487
Issue number2
DOIs
Publication statusPublished - Aug 2019

Cite this

Diemer, Benedikt ; Stevens, Adam R. H. ; Lagos, Claudia del P. ; Calette, A. R. ; Tacchella, Sandro ; Hernquist, Lars ; Marinacci, Federico ; Nelson, Dylan ; Pillepich, Annalisa ; Rodriguez-Gomez, Vicente ; Villaescusa-Navarro, Francisco ; Vogelsberger, Mark. / Atomic and molecular gas in IllustrisTNG galaxies at low redshift. In: Monthly Notices of the Royal Astronomical Society. 2019 ; Vol. 487, No. 2. pp. 1529-1550.
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abstract = "We have recently developed a post-processing framework to estimate the abundance of atomic and molecular hydrogen (H I and H-2, respectively) in galaxies in large-volume cosmological simulations. Here we compare the HI and H-2 content of IllustrisTNG galaxies to observations. We mostly restrict this comparison to z approximate to 0 and consider six observational metrics: the overall abundance of HI and H-2, their mass functions, gas fractions as a function of stellar mass, the correlation between H-2 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 HI mass-size relation. The H-2 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 HI/H-2 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.",
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author = "Benedikt Diemer and Stevens, {Adam R. H.} and Lagos, {Claudia del P.} and Calette, {A. R.} and Sandro Tacchella and Lars Hernquist and Federico Marinacci and Dylan Nelson and Annalisa Pillepich and Vicente Rodriguez-Gomez and Francisco Villaescusa-Navarro and Mark Vogelsberger",
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Diemer, B, Stevens, ARH, Lagos, CDP, Calette, AR, Tacchella, S, Hernquist, L, Marinacci, F, Nelson, D, Pillepich, A, Rodriguez-Gomez, V, Villaescusa-Navarro, F & Vogelsberger, M 2019, 'Atomic and molecular gas in IllustrisTNG galaxies at low redshift' Monthly Notices of the Royal Astronomical Society, vol. 487, no. 2, pp. 1529-1550. https://doi.org/10.1093/mnras/stz1323

Atomic and molecular gas in IllustrisTNG galaxies at low redshift. / Diemer, Benedikt; Stevens, Adam R. H.; Lagos, Claudia del P.; Calette, A. R.; Tacchella, Sandro; Hernquist, Lars; Marinacci, Federico; Nelson, Dylan; Pillepich, Annalisa; Rodriguez-Gomez, Vicente; Villaescusa-Navarro, Francisco; Vogelsberger, Mark.

In: Monthly Notices of the Royal Astronomical Society, Vol. 487, No. 2, 08.2019, p. 1529-1550.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Atomic and molecular gas in IllustrisTNG galaxies at low redshift

AU - Diemer, Benedikt

AU - Stevens, Adam R. H.

AU - Lagos, Claudia del P.

AU - Calette, A. R.

AU - Tacchella, Sandro

AU - Hernquist, Lars

AU - Marinacci, Federico

AU - Nelson, Dylan

AU - Pillepich, Annalisa

AU - Rodriguez-Gomez, Vicente

AU - Villaescusa-Navarro, Francisco

AU - Vogelsberger, Mark

PY - 2019/8

Y1 - 2019/8

N2 - We have recently developed a post-processing framework to estimate the abundance of atomic and molecular hydrogen (H I and H-2, respectively) in galaxies in large-volume cosmological simulations. Here we compare the HI and H-2 content of IllustrisTNG galaxies to observations. We mostly restrict this comparison to z approximate to 0 and consider six observational metrics: the overall abundance of HI and H-2, their mass functions, gas fractions as a function of stellar mass, the correlation between H-2 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 HI mass-size relation. The H-2 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 HI/H-2 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.

AB - We have recently developed a post-processing framework to estimate the abundance of atomic and molecular hydrogen (H I and H-2, respectively) in galaxies in large-volume cosmological simulations. Here we compare the HI and H-2 content of IllustrisTNG galaxies to observations. We mostly restrict this comparison to z approximate to 0 and consider six observational metrics: the overall abundance of HI and H-2, their mass functions, gas fractions as a function of stellar mass, the correlation between H-2 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 HI mass-size relation. The H-2 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 HI/H-2 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.

KW - ISM: molecules

KW - galaxies: abundances

KW - galaxies: star formation

KW - galaxies: structure

KW - STAR-FORMATION LAW

KW - H-I MASS

KW - SPECTROSCOPIC-EXPLORER SURVEY

KW - SURFACE-BRIGHTNESS GALAXY

KW - CO LUMINOSITY FUNCTIONS

KW - CO-H2 CONVERSION FACTOR

KW - NEARBY FIELD GALAXIES

KW - ARECIBO SDSS SURVEY

KW - IRAM LEGACY SURVEY

KW - SCALING RELATIONS

U2 - 10.1093/mnras/stz1323

DO - 10.1093/mnras/stz1323

M3 - Article

VL - 487

SP - 1529

EP - 1550

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 2

ER -