{
  "id": "2205.00675",
  "version": "v1",
  "published": "2022-05-02T06:30:07.000Z",
  "updated": "2022-05-02T06:30:07.000Z",
  "title": "Using EAGLE simulations to study the effect of observational constraints on the determination of HI asymmetries in galaxies",
  "authors": [
    "P. V. Bilimogga",
    "K. A. Oman",
    "M. A. W. Verheijen",
    "J. M. van der Hulst"
  ],
  "comment": "19 pages, 12 figures and 2 appendices. Accepted for publication in the Monthly Notices of the Royal Astronomical Soceity",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We investigate the effect of observational constraints such as signal-to-noise, resolution and column density level on the HI morphological asymmetry ($\\mathrm{A}_\\mathrm{mod}$) and the effect of noise on the HI global profile ($\\mathrm{A}_\\mathrm{flux}$) asymmetry indices. Using mock galaxies from the EAGLE simulations we find an optimal combination of the observational constraints that are required for robust measurement of the $\\mathrm{A}_\\mathrm{mod}$ value of a galaxy: a column density threshold of $5\\times10^{19}cm^{-2}$ or lower at a minimal signal-to-noise of 3 and a galaxy resolved with at least 11 beams. We also use mock galaxies to investigate the effect of noise on the $\\mathrm{A}_\\mathrm{flux}$ values and conclude that a global profile with signal-to-noise ratio greater than 5.5 is required to achieve a robust measurement of asymmetry. We investigate the relation between $\\mathrm{A}_\\mathrm{mod}$ and $\\mathrm{A}_\\mathrm{flux}$ indices and find them to be uncorrelated which implies that $\\mathrm{A}_\\mathrm{flux}$ values cannot be used to predict morphological asymmetries in galaxies.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2022-05-02T06:30:07.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "observational constraints",
      "eagle simulations",
      "hi asymmetries",
      "robust measurement",
      "mock galaxies"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 19,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}