{
  "id": "1702.07036",
  "version": "v1",
  "published": "2017-02-22T22:57:28.000Z",
  "updated": "2017-02-22T22:57:28.000Z",
  "title": "Radio Follow-up on all Unassociated Gamma-ray Sources from the Third Fermi Large Area Telescope Source Catalog",
  "authors": [
    "F. K. Schinzel",
    "L. Petrov",
    "G. B. Taylor",
    "P. G. Edwards"
  ],
  "comment": "14 pages, 9 figures, 6 tables, 5 machine readable tables, accepted for publication in ApJS",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "The third Fermi Large Area Telescope (LAT) $\\gamma$-ray source catalog (3FGL) contains over 1000 objects for which there is no known counterpart at other wavelengths. The physical origin of the $\\gamma$-ray emission of those objects is unknown. Such objects are commonly referred to as unassociated and mostly do not exhibit significant $\\gamma$-ray flux variability. We performed a survey of all unassociated $\\gamma$-ray sources found in 3FGL using the Australia Telescope Compact Array and Very Large Array in the range of 4.0-10.0 GHz. We found 2097 radio candidates for association with $\\gamma$-ray sources. The follow-up with very long baseline interferometry for a subset of those candidates yielded 142 new AGN associations with $\\gamma$-ray sources, provided alternative associations for 7 objects, and improved positions for another 144 known associations to the milliarcsecond level of accuracy. In addition, for 245 unassociated $\\gamma$-ray sources we did not find a single compact radio source above 2 mJy within 3$\\sigma$ of their $\\gamma$-ray localization. A significant fraction of these empty fields, 39%, are located away from the galactic plane. We also found 36 extended radio sources that are candidates for association with a corresponding $\\gamma$-ray object, 19 of which are most likely supernova remnants or HII regions, whereas 17 could be radio galaxies.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-02-22T22:57:28.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "third fermi large area telescope",
      "large area telescope source catalog",
      "fermi large area telescope source",
      "unassociated gamma-ray sources"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 14,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}