{
  "id": "2006.14314",
  "version": "v1",
  "published": "2020-06-25T11:29:13.000Z",
  "updated": "2020-06-25T11:29:13.000Z",
  "title": "Discovery of a near-infrared bar and a pseudobulge in the collisional ring galaxy Cartwheel",
  "authors": [
    "Sudhanshu Barway",
    "Y. D. Mayya",
    "Aitor Robleto-Orús"
  ],
  "comment": "Accepted for publication in MNRAS, 8 pages, 3 figures, 2 tables",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We report the discovery of a bar, a pseudobulge and unresolved point source in the archetype collisional ring galaxy Cartwheel using careful morphological analysis of a near-infrared (NIR) K$_s$ band image of excellent quality (seeing=0.42\\arcsec) at the ESO archive. The bar is oval-shaped with a semi-major axis length of 3.23\\arcsec\\($\\sim$2.09~kpc), with almost a flat light distribution along it. The bulge is almost round (ellipticity=0.21) with an effective radius of 1.62\\arcsec\\ ($\\sim$1.05~kpc) and a Sersic index of 0.99, parameters typical of pseudobulges in late-type galaxies. The newly discovered bar is not recognisable as such in the optical images even with more than a factor of two higher spatial resolution of the Hubble Space Telescope, due to a combination of its red colour and the presence of dusty features. The observed bar and pseudobulge most likely belonged to the pre-collisional progenitor of the Cartwheel. The discovery of a bar in an archetype collisional ring galaxy Cartwheel is the first observational evidence to confirm the prediction that bars can survive a drop-through collision along with the morphological structures like a central bulge (pseudo).",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-06-25T11:29:13.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "pseudobulge",
      "near-infrared bar",
      "archetype collisional ring galaxy cartwheel",
      "semi-major axis length",
      "flat light distribution"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 8,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}