{
  "id": "1512.04527",
  "version": "v1",
  "published": "2015-12-14T21:00:00.000Z",
  "updated": "2015-12-14T21:00:00.000Z",
  "title": "The discovery of lensed radio and X-ray sources behind the Frontier Fields cluster MACS J0717.5+3745 with the JVLA and Chandra",
  "authors": [
    "R. J. van Weeren",
    "G. A. Ogrean",
    "C. Jones",
    "W. R. Forman",
    "F. Andrade-Santos",
    "A. Bonafede",
    "M. Brüggen",
    "E. Bulbul",
    "T. E. Clarke",
    "E. Churazov",
    "L. David",
    "W. A. Dawson",
    "M. Donahue",
    "A. Goulding",
    "R. P. Kraft",
    "B. Mason",
    "J. Merten",
    "T. Mroczkowski",
    "S. S. Murray",
    "P. E. J. Nulsen",
    "P. Rosati",
    "E. Roediger",
    "S. W. Randall",
    "J. Sayers",
    "K. Umetsu",
    "A. Vikhlinin",
    "A. Zitrin"
  ],
  "comment": "14 pages, 6 figures, accepted for publication in ApJ",
  "categories": [
    "astro-ph.GA",
    "astro-ph.CO"
  ],
  "abstract": "We report on high-resolution JVLA and Chandra observations of the HST Frontier Cluster MACS J0717.5+3745. MACS J0717.5+3745 offers the largest contiguous magnified area of any known cluster, making it a promising target to search for lensed radio and X-ray sources. With the high-resolution 1.0-6.5 GHz JVLA imaging in A and B configuration, we detect a total of 51 compact radio sources within the area covered by the HST imaging. Within this sample we find 7 lensed sources with amplification factors larger than $2$. None of these sources are identified as multiply-lensed. Based on the radio luminosities, the majority of these sources are likely star forming galaxies with star formation rates of 10-50 M$_\\odot$ yr$^{-1}$ located at $1 \\lesssim z \\lesssim 2$. Two of the lensed radio sources are also detected in the Chandra image of the cluster. These two sources are likely AGN, given their $2-10$ keV X-ray luminosities of $\\sim 10^{43-44}$ erg s$^{-1}$. From the derived radio luminosity function, we find evidence for an increase in the number density of radio sources at $0.6<z<2.0$, compared to a $z < 0.3$ sample. Our observations indicate that deep radio imaging of lensing clusters can be used to study star forming galaxies, with star formation rates as low as $\\sim10$ M$_{\\odot}$ yr$^{-1}$, at the peak of cosmic star formation history.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-12-14T21:00:00.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "frontier fields cluster macs",
      "lensed radio",
      "x-ray sources",
      "radio sources",
      "star formation rates"
    ],
    "publication": {
      "doi": "10.3847/0004-637X/817/2/98"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 14,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1409691
    }
  }
}