Global H i asymmetries in IllustrisTNG: a diversity of physical processes disturb the cold gas in galaxies

  title={Global H i asymmetries in IllustrisTNG: a diversity of physical processes disturb the cold gas in galaxies},
  author={Adam Bene Watts and Chris Power and Barbara Catinella and Luca Cortese and Adam R. H. Stevens},
  journal={arXiv: Astrophysics of Galaxies},
Observations of the cold neutral atomic hydrogen (HI) in and around disc galaxies have revealed that spatial and kinematic asymmetries are commonplace, and are reflected in the global HI spectra. We use the TNG100 box from the IllustrisTNG suite of cosmological simulations to study the conditions under which these asymmetries may arise in current theoretical galaxy formation models. We find that more than 50% of the sample has at least a 10% difference in integrated flux between the high- and… 

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