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We investigate the influence of environment on the cold-gas properties ofgalaxies at z=0 within the TNG100 cosmological, magnetohydrodynamic simulation,part of the IllustrisTNG suite. We extend previous post-processing methods forbreaking gas cells into their atomic and molecular phases, and build detailedmocks to comprehensively compare to the latest surveys of atomic hydrogen (HI)in nearby galaxies, namely ALFALFA and xGASS. We use TNG100 to explore the HIcontent, star formation activity, and angular momentum of satellite galaxies,each as a function of environment, and find that satellites are typically afactor of ~3 poorer in HI than centrals of the same stellar mass, with theexact offset depending sensitively on parent halo mass. Due to the largephysical scales on which HI measurements are made (~45--245 kpc), contributionsfrom gas not bound to the galaxy of interest but in the same line of sightcrucially lead to larger HI mass measurements in the mocks in many cases,ultimately aligning with observations. This effect is mass-dependent andnaturally greater for satellites than centrals, as satellites are neverisolated by definition. We also show that HI stripping in TNG100 satellites isclosely accompanied by quenching, in tension with observational data thatinstead favour that HI is preferentially stripped before star formation isreduced.

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