{
  "id": "1510.05769",
  "version": "v1",
  "published": "2015-10-20T06:51:18.000Z",
  "updated": "2015-10-20T06:51:18.000Z",
  "title": "Photometric metallicity map of the Large Magellanic Cloud",
  "authors": [
    "Samyaday Choudhury",
    "Annapurni Subramaniam",
    "Andrew A. Cole"
  ],
  "comment": "28 pages, 40 figures, 7 tables, Accepted for publication in MNRAS",
  "doi": "10.1093/mnras/stv2414",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We have estimated a metallicity map of the Large Magellanic Cloud (LMC) 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 4 - 5 degrees, derived using photometric data and calibrated using spectroscopic data of Red Giant Branch (RGB) stars. 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 spectroscopic data for field and cluster red giants in selected subregions. The average metallicity of the LMC is found to be [Fe/H] = $-$0.37 dex ($\\sigma$[Fe/H] = 0.12) from MCPS data, and [Fe/H] = $-$0.39 dex ($\\sigma$[Fe/H] = 0.10) from OGLE III data. The bar is found be the most metal-rich region of the LMC. Both the data sets suggest a shallow radial metallicity gradient up to a radius of 4 kpc ($-$0.049$\\pm$0.002 dex kpc$^{-1}$ to $-$0.066$\\pm$0.006 dex kpc$^{-1}$). Subregions in which the mean metallicity differs from the surrounding areas do not appear to correlate with previously known features; spectroscopic studies are required in order to assess their physical significance.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-10-20T06:51:18.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "large magellanic cloud",
      "photometric metallicity map",
      "magellanic cloud photometric survey",
      "dex kpc",
      "average metallicity"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 28,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}