ASymba: HI global profile asymmetries in the Simba simulation
arXiv:2209.09269 · doi:10.1093/mnras/stac2684
Abstract
Asymmetry in the spatially integrated, 1D HI global profiles of galaxies can inform us on both internal (e.g. outflows) and external (e.g. mergers, tidal interactions, ram pressure stripping) processes that shape galaxy evolution. Understanding which of these primarily drive HI profile asymmetry is of particular interest. In the lead-up to SKA pathfinder and SKA HI emission surveys, hydrodynamical simulations have proved to be a useful resource for such studies. Here we present the methodology behind, as well as first results, of ASymba: Asymmetries in HI of Simba galaxies, the first time this simulation suite has been used for this type of study. We generate mock observations of the HI content of these galaxies and calculate the profile asymmetries using three different methods. We find that has the strongest correlation with all asymmetry measures, with weaker correlations also found with the number of mergers a galaxy has undergone, and gas and galaxy rotation. We also find good agreement with the xGASS sample, in that galaxies with highly asymmetric profiles tend to have lower HI gas fractions than galaxies with symmetric profiles, and additionally find the same holds in sSFR parameter space. For low HI mass galaxies, it is difficult to distinguish between asymmetric and symmetric galaxies, but this becomes achievable in the high HI mass population. These results showcase the potential of ASymba and provide the groundwork for further studies, including comparison to upcoming large HI emission surveys.
17 pages, 10 figures, 2 tables. Accepted in MNRAS
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Cited by in corpus (6)
- WALLABY Pilot Survey: HI in the host galaxy of a Fast Radio Burst
- MARTINI: Mock Array Radio Telescope Interferometry of the Neutral ISM
- Measuring Galaxy Asymmetries in 3D
- On the consistency of rotation curves and spatially integrated HI flux profiles
- HI asymmetries in spatially resolved SIMBA galaxies
- WALLABY Pilot Survey & ASymba: Comparing HI Detection Asymmetries to the SIMBA Simulation