{
  "id": "1312.1694",
  "version": "v2",
  "published": "2013-12-05T21:00:05.000Z",
  "updated": "2013-12-11T22:33:02.000Z",
  "title": "Star formation in the cluster CLG0218.3-0510 at z=1.62 and its large-scale environment: the infrared perspective",
  "authors": [
    "Joana S. Santos",
    "Bruno Altieri",
    "Masayuki Tanaka",
    "Ivan Valtchanov",
    "Amelie Saintonge",
    "Mark Dickinson",
    "Sebastien Foucaud",
    "Tadayuki Kodama",
    "Tim D. Rawle",
    "Ken-ichi Tadaki"
  ],
  "comment": "accepted for publication in MNRAS. v2: minor corrections",
  "categories": [
    "astro-ph.GA",
    "astro-ph.CO"
  ],
  "abstract": "The galaxy cluster CLG0218.3-0510 at z=1.62 is one of the most distant galaxy clusters known, with a rich muti-wavelength data set that confirms a mature galaxy population already in place. Using very deep, wide area (20x20 Mpc) imaging by Spitzer/MIPS at 24um, in conjunction with Herschel 5-band imaging from 100-500um, we investigate the dust-obscured, star-formation properties in the cluster and its associated large scale environment. Our galaxy sample of 693 galaxies at z=1.62 detected at 24um (10 spectroscopic and 683 photo-z) includes both cluster galaxies (i.e. within r <1 Mpc projected clustercentric radius) and field galaxies, defined as the region beyond a radius of 3 Mpc. The star-formation rates (SFRs) derived from the measured infrared luminosity range from 18 to 2500 Ms/yr, with a median of 55 Ms/yr, over the entire radial range (10 Mpc). The cluster brightest FIR galaxy, taken as the centre of the galaxy system, is vigorously forming stars at a rate of 256$\\pm$70 Ms/yr, and the total cluster SFR enclosed in a circle of 1 Mpc is 1161$\\pm$96 Ms/yr. We estimate a dust extinction of about 3 magnitudes by comparing the SFRs derived from [OII] luminosity with the ones computed from the 24um fluxes. We find that the in-falling region (1-3 Mpc) is special: there is a significant decrement (3.5x) of passive relative to star-forming galaxies in this region, and the total SFR of the galaxies located in this region is lower (130 Ms/yr/Mpc2) than anywhere in the cluster or field, regardless of their stellar mass. In a complementary approach we compute the local galaxy density, Sigma5, and find no trend between SFR and Sigma5. However, we measure an excess of star-forming galaxies in the cluster relative to the field by a factor 1.7, that lends support to a reversal of the SF-density relation in CLG0218.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2013-12-11T22:33:02.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "large-scale environment",
      "star formation",
      "infrared perspective",
      "rich muti-wavelength data set",
      "cluster brightest fir galaxy"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1093/mnras/stt2376",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2014,
      "month": "Mar",
      "volume": 438,
      "number": 3,
      "pages": 2565
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1268116,
      "adsabs": "2014MNRAS.438.2565S"
    }
  }
}