{
  "id": "1801.03403",
  "version": "v1",
  "published": "2018-01-09T04:58:04.000Z",
  "updated": "2018-01-09T04:58:04.000Z",
  "title": "Photometric metallicity map of the Small Magellanic Cloud",
  "authors": [
    "Samyaday Choudhury",
    "Annapurni Subramaniam",
    "Andrew A. Cole",
    "Young-Jong Sohn"
  ],
  "comment": "27 pages, 29 figures, Accepted for publication in MNRAS. arXiv admin note: text overlap with arXiv:1510.05769",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We have created an estimated metallicity map of the Small Magellanic Cloud (SMC) using the Magellanic Cloud Photometric Survey (MCPS) and Optical Gravitational Lensing Experiment (OGLE III) photometric data. This is a first of its kind map of metallicity up to a radius of $\\sim$ 2.5$^{\\circ}$. We identify the RGB in the V, (V$-$I) colour magnitude diagrams of small subregions of varying sizes in both data sets. We use the slope of the RGB as an indicator of the average metallicity of a subregion, and calibrate the RGB slope to metallicity using available spectroscopic data for selected subregions. The average metallicity of the SMC is found to be [Fe/H] = $-$0.94 dex ($\\sigma$[Fe/H] = 0.09) from OGLE III, and [Fe/H] = $-$0.95 dex ($\\sigma$[Fe/H] = 0.08) from MCPS. We confirm a shallow but significant metallicity gradient within the inner SMC up to a radius of 2.5$^{\\circ}$ ($-$0.045$\\pm$0.004 dex deg$^{-1}$ to $-$0.067$\\pm$0.006 dex deg$^{-1}$).",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-01-09T04:58:04.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "small magellanic cloud",
      "photometric metallicity map",
      "dex deg",
      "magellanic cloud photometric survey",
      "average metallicity"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 27,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}