{
  "id": "1703.10616",
  "version": "v1",
  "published": "2017-03-30T18:01:37.000Z",
  "updated": "2017-03-30T18:01:37.000Z",
  "title": "The Carnegie-Chicago Hubble Program. III. The Distance to NGC 1365 via the Tip of the Red Giant Branch",
  "authors": [
    "In Sung Jang",
    "Dylan Hatt",
    "Rachael L. Beaton",
    "Myung Gyoon Lee",
    "Wendy L. Freedman",
    "Barry F. Madore",
    "Taylor J. Hoyt",
    "Andrew J. Monson",
    "Jeffrey A. Rich",
    "Victoria Scowcroft",
    "Mark Seibert"
  ],
  "comment": "18 pages, 9 figures, 2 tables, submitted to ApJ",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "The Carnegie-Chicago Hubble Program seeks to anchor the distance scale of Type Ia supernovae via the Tip of the Red Giant Branch (TRGB). Based on deep $Hubble$ $Space$ $Telescope$ ACS/WFC imaging, we present an analysis of the TRGB for the metal-poor halo of NGC 1365, a giant spiral galaxy in the Fornax Cluster that is host to the supernova SN2012fr. We have measured its extinction-corrected TRGB magnitude to be F814W = 27.34 $\\pm 0.03_{stat} \\pm0.01_{sys}$ mag. In advance of future direct calibration by $Gaia$, we set a provisional TRGB luminosity via the Large Magellanic Cloud and find a true distance modulus $\\mu_0 = 31.29 \\pm 0.04_{stat}\\pm0.05_{sys}$ mag or $D = 18.4 \\pm 0.03_{stat} \\pm0.04_{sys}$ Mpc. This high-fidelity measurement shows excellent agreement with recent Cepheid-based distances to NGC 1365 and suggests no significant difference in the distances derived from stars of Population I and II. We revisit the error budget for the $CCHP$ path to the Hubble Constant based on this analysis of one of our most distant hosts, finding a 2.5\\% measurement is feasible with our current sample.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-03-30T18:01:37.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "red giant branch",
      "type ia supernovae",
      "giant spiral galaxy",
      "carnegie-chicago hubble program seeks",
      "provisional trgb luminosity"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 18,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}