Atomic hydrogen in IllustrisTNG galaxies: the impact of environment parallelled with local 21-cm surveys

Adam R. H. Stevens, Benedikt Diemer, Claudia del P. Lagos, Dylan Nelson, Annalisa Pillepich, Toby Brown, Barbara Catinella, Lars Hernquist, Rainer Weinberger, Mark Vogelsberger, Federico Marinacci

Research output: Contribution to journalArticle

Abstract

We investigate the influence of environment on the cold-gas properties of galaxies at z = 0 within the TNG100 cosmological, magnetohydrodynamic simulation, part of the IllustrisTNG suite. We extend previous post-processing methods for breaking gas cells into their atomic and molecular phases, and build detailed mocks to comprehensively compare to the latest surveys of atomic hydrogen (H I) in nearby galaxies, namely ALFALFA and xGASS. We use TNG100 to explore the H I content, star formation activity, and angular momentum of satellite galaxies, each as a function of environment, and find that satellites are typically a factor of greater than or similar to 3 poorer in H I than centrals of the same stellar mass, with the exact offset depending sensitively on parent halo mass. Due to the large physical scales on which H I measurements are made (similar to 45-245 kpc), contributions from gas not bound to the galaxy of interest but in the same line of sight crucially lead to larger H I mass measurements in the mocks in many cases, ultimately aligning with observations. This effect is mass-dependent and naturally greater for satellites than centrals, as satellites are never isolated by definition. We also show that H I stripping in TNG100 satellites is closely accompanied by quenching, in tension with observational data that instead favour that H I is preferentially stripped before star formation is reduced.

Original languageEnglish
Pages (from-to)5334-5354
Number of pages21
JournalMonthly Notices of the Royal Astronomical Society
Volume483
Issue number4
DOIs
Publication statusPublished - Mar 2019

Cite this

Stevens, Adam R. H. ; Diemer, Benedikt ; Lagos, Claudia del P. ; Nelson, Dylan ; Pillepich, Annalisa ; Brown, Toby ; Catinella, Barbara ; Hernquist, Lars ; Weinberger, Rainer ; Vogelsberger, Mark ; Marinacci, Federico. / Atomic hydrogen in IllustrisTNG galaxies : the impact of environment parallelled with local 21-cm surveys. In: Monthly Notices of the Royal Astronomical Society. 2019 ; Vol. 483, No. 4. pp. 5334-5354.
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abstract = "We investigate the influence of environment on the cold-gas properties of galaxies at z = 0 within the TNG100 cosmological, magnetohydrodynamic simulation, part of the IllustrisTNG suite. We extend previous post-processing methods for breaking gas cells into their atomic and molecular phases, and build detailed mocks to comprehensively compare to the latest surveys of atomic hydrogen (H I) in nearby galaxies, namely ALFALFA and xGASS. We use TNG100 to explore the H I content, star formation activity, and angular momentum of satellite galaxies, each as a function of environment, and find that satellites are typically a factor of greater than or similar to 3 poorer in H I than centrals of the same stellar mass, with the exact offset depending sensitively on parent halo mass. Due to the large physical scales on which H I measurements are made (similar to 45-245 kpc), contributions from gas not bound to the galaxy of interest but in the same line of sight crucially lead to larger H I mass measurements in the mocks in many cases, ultimately aligning with observations. This effect is mass-dependent and naturally greater for satellites than centrals, as satellites are never isolated by definition. We also show that H I stripping in TNG100 satellites is closely accompanied by quenching, in tension with observational data that instead favour that H I is preferentially stripped before star formation is reduced.",
keywords = "galaxies: evolution, galaxies: haloes, galaxies: interactions, galaxies: ISM, galaxies: star formation, TO-MOLECULAR TRANSITION, STAR-FORMATION RATES, ARECIBO SDSS SURVEY, H I, RAM-PRESSURE, COSMOLOGICAL SIMULATIONS, STELLAR MASS, GAS CONTENT, PHYSICAL-PROPERTIES, SEMIANALYTIC MODEL",
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Atomic hydrogen in IllustrisTNG galaxies : the impact of environment parallelled with local 21-cm surveys. / Stevens, Adam R. H.; Diemer, Benedikt; Lagos, Claudia del P.; Nelson, Dylan; Pillepich, Annalisa; Brown, Toby; Catinella, Barbara; Hernquist, Lars; Weinberger, Rainer; Vogelsberger, Mark; Marinacci, Federico.

In: Monthly Notices of the Royal Astronomical Society, Vol. 483, No. 4, 03.2019, p. 5334-5354.

Research output: Contribution to journalArticle

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T1 - Atomic hydrogen in IllustrisTNG galaxies

T2 - the impact of environment parallelled with local 21-cm surveys

AU - Stevens, Adam R. H.

AU - Diemer, Benedikt

AU - Lagos, Claudia del P.

AU - Nelson, Dylan

AU - Pillepich, Annalisa

AU - Brown, Toby

AU - Catinella, Barbara

AU - Hernquist, Lars

AU - Weinberger, Rainer

AU - Vogelsberger, Mark

AU - Marinacci, Federico

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N2 - We investigate the influence of environment on the cold-gas properties of galaxies at z = 0 within the TNG100 cosmological, magnetohydrodynamic simulation, part of the IllustrisTNG suite. We extend previous post-processing methods for breaking gas cells into their atomic and molecular phases, and build detailed mocks to comprehensively compare to the latest surveys of atomic hydrogen (H I) in nearby galaxies, namely ALFALFA and xGASS. We use TNG100 to explore the H I content, star formation activity, and angular momentum of satellite galaxies, each as a function of environment, and find that satellites are typically a factor of greater than or similar to 3 poorer in H I than centrals of the same stellar mass, with the exact offset depending sensitively on parent halo mass. Due to the large physical scales on which H I measurements are made (similar to 45-245 kpc), contributions from gas not bound to the galaxy of interest but in the same line of sight crucially lead to larger H I mass measurements in the mocks in many cases, ultimately aligning with observations. This effect is mass-dependent and naturally greater for satellites than centrals, as satellites are never isolated by definition. We also show that H I stripping in TNG100 satellites is closely accompanied by quenching, in tension with observational data that instead favour that H I is preferentially stripped before star formation is reduced.

AB - We investigate the influence of environment on the cold-gas properties of galaxies at z = 0 within the TNG100 cosmological, magnetohydrodynamic simulation, part of the IllustrisTNG suite. We extend previous post-processing methods for breaking gas cells into their atomic and molecular phases, and build detailed mocks to comprehensively compare to the latest surveys of atomic hydrogen (H I) in nearby galaxies, namely ALFALFA and xGASS. We use TNG100 to explore the H I content, star formation activity, and angular momentum of satellite galaxies, each as a function of environment, and find that satellites are typically a factor of greater than or similar to 3 poorer in H I than centrals of the same stellar mass, with the exact offset depending sensitively on parent halo mass. Due to the large physical scales on which H I measurements are made (similar to 45-245 kpc), contributions from gas not bound to the galaxy of interest but in the same line of sight crucially lead to larger H I mass measurements in the mocks in many cases, ultimately aligning with observations. This effect is mass-dependent and naturally greater for satellites than centrals, as satellites are never isolated by definition. We also show that H I stripping in TNG100 satellites is closely accompanied by quenching, in tension with observational data that instead favour that H I is preferentially stripped before star formation is reduced.

KW - galaxies: evolution

KW - galaxies: haloes

KW - galaxies: interactions

KW - galaxies: ISM

KW - galaxies: star formation

KW - TO-MOLECULAR TRANSITION

KW - STAR-FORMATION RATES

KW - ARECIBO SDSS SURVEY

KW - H I

KW - RAM-PRESSURE

KW - COSMOLOGICAL SIMULATIONS

KW - STELLAR MASS

KW - GAS CONTENT

KW - PHYSICAL-PROPERTIES

KW - SEMIANALYTIC MODEL

U2 - 10.1093/mnras/sty3451

DO - 10.1093/mnras/sty3451

M3 - Article

VL - 483

SP - 5334

EP - 5354

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

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ER -