{
  "id": "1810.04938",
  "version": "v1",
  "published": "2018-10-11T10:12:11.000Z",
  "updated": "2018-10-11T10:12:11.000Z",
  "title": "A Dearth of Atomic Hydrogen in NGC1052-DF2",
  "authors": [
    "Aditya Chowdhury"
  ],
  "comment": "3 pages, 2 figures; accepted for publication in MNRAS Letters",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "The recently claimed discovery of an ultra-diffuse galaxy lacking dark matter has important implications for alternate theories to dark matter as well as models of galaxy formation within the $\\Lambda$CDM context. In this letter, we present a deep Giant Metrewave Radio Telescope (GMRT) search for atomic hydrogen in this ultra-diffuse galaxy, NGC1052-DF2. We report a non-detection of the HI21cm transition from the galaxy and place a stringent upper-limit on the HI mass of the galaxy - $M_{HI} < 3.15 \\times 10^6 \\ ({\\Delta V}/20 \\ \\textrm{km/s})^{1/2} \\ M_\\odot \\ (3\\sigma)$. This makes NGC1052-DF2 an extremely gas poor galaxy with an atomic gas to stellar mass fraction of $M_{HI}/M_* \\ < \\ 0.016 \\ ({\\Delta V}/20 \\ \\textrm{km/s})^{1/2} \\ (3\\sigma)$. Such low gas fractions are typical of dwarf ellipticals in dense environments and would be consistent with NGC1052-DF2 being a tidal dwarf, a scenario that can explain its apparent lack of dark matter.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-10-11T10:12:11.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "atomic hydrogen",
      "ngc1052-df2",
      "deep giant metrewave radio telescope",
      "ultra-diffuse galaxy lacking dark matter",
      "low gas fractions"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 3,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}