{
  "id": "1701.08484",
  "version": "v1",
  "published": "2017-01-30T05:22:46.000Z",
  "updated": "2017-01-30T05:22:46.000Z",
  "title": "Young Galaxy Candidates in the Hubble Frontier Fields IV. MACS J1149.5+2223",
  "authors": [
    "W. Zheng",
    "A. Zitrin",
    "L. Infante",
    "N. Laporte",
    "X. X. Huang",
    "J. Moustakas",
    "H. C. Ford",
    "X. W. Shu",
    "J. X. Wang",
    "J. M. Diego",
    "F. E. Bauer",
    "P. T. Iribarren",
    "T. Broadhurst",
    "A. Molino"
  ],
  "comment": "To appear in the Astrophysical Journal. 14 pages, 6 figures, 3 tables",
  "categories": [
    "astro-ph.GA",
    "astro-ph.CO"
  ],
  "abstract": "We search for high-redshift dropout galaxies behind the Hubble Frontier Fields (HFF) galaxy cluster MACS J1149.5+2223, a powerful cosmic lens that has revealed a number of unique objects in its field. Using the deep images from the Hubble and Spitzer space telescopes, we find 11 galaxies at z>7 in the MACS J1149.5+2223 cluster field, and 11 in its parallel field. The high-redshift nature of the bright z~9.6 galaxy MACS1149-JD, previously reported by Zheng et al. (2012), is further supported by non-detection in the extremely deep optical images from the HFF campaign. With the new photometry, the best photometric redshift solution for MACS1149-JD reduces slightly to z=9.44 +/- 0.12. The young galaxy has an estimated stellar mass of (7 +/- 2)X10E8 Msun, and was formed at z=13.2 +1.9-1.6 when the Universe was ~300 Myr old. Data available for the first four HFF clusters have already enabled us to find faint galaxies to an intrinsic magnitude of M(UV) ~ -15.5, approximately a factor of ten deeper than the parallel fields.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-01-30T05:22:46.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "hubble frontier fields",
      "young galaxy candidates",
      "parallel field",
      "best photometric redshift solution",
      "spitzer space telescopes"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 14,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}