{
  "id": "1404.1841",
  "version": "v1",
  "published": "2014-04-07T16:31:07.000Z",
  "updated": "2014-04-07T16:31:07.000Z",
  "title": "Spatially Resolving the Very High Energy emission from MGRO J2019+37 with VERITAS",
  "authors": [
    "VERITAS Collaboration"
  ],
  "comment": "9 pages, 8 figures, accepted for publication in the Astrophysical Journal",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "We present very high energy (VHE) imaging of MGRO J2019+37 obtained with the VERITAS observatory. The bright extended ($\\sim2^{\\circ}$) unidentified Milagro source is located towards the rich star formation region Cygnus-X. MGRO J2019+37 is resolved into two VERITAS sources. The faint point-like source VER J2016+371 overlaps CTB 87, a filled-center remnant (SNR) with no evidence of a supernova remnant shell at the present time. Its spectrum is well fit in the $0.65 - 10$ TeV energy range by a power-law model with photon index $2.3\\pm0.4$. VER J2019+368 is a bright extended ($\\sim1^{\\circ}$) source, that likely accounts for the bulk of the Milagro emission and is notably coincident with PSR J2021+3651 and the star formation region Sh 2-104. Its spectrum in the range $1-30$ TeV is well fit with a power-law model of photon index $1.75\\pm0.3$, among the hardest values measured in the VHE band, comparable to that observed near Vela-X. We explore the unusual spectrum and morphology in the radio and X-ray bands to constrain possible emission mechanisms for this source.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-04-07T16:31:07.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "high energy emission",
      "spatially resolving",
      "rich star formation region cygnus-x",
      "power-law model",
      "star formation region sh"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1088/0004-637X/788/1/78",
      "journal": "The Astrophysical Journal",
      "year": 2014,
      "month": "Jun",
      "volume": 788,
      "number": 1,
      "pages": 78
    },
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1288854,
      "adsabs": "2014ApJ...788...78A"
    }
  }
}