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H-ATLAS: a candidate high redshift cluster/protocluster of star-forming galaxies

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  • D. L. Clements
  • F. Braglia
  • G. Petitpas
  • J. Greenslade
  • A. Cooray
  • E. Valiante
  • G. De Zotti
  • B. O'Halloran
  • J. Holdship
  • B. Morris
  • I. Pérez-Fournon
  • D. Herranz
  • D. Riechers
  • M. Baes
  • M. Bremer
  • N. Bourne
  • H. Dannerbauer
  • A. Dariush
  • L. Dunne
  • S. Eales
  • J. Fritz
  • J. Gonzalez-Nuevo
  • R. Hopwood
  • E. Ibar
  • R. J. Ivison
  • L. L. Leeuw
  • S. Maddox
  • M. J. Michałowski
  • M. Negrello
  • A. Omont
  • I. Oteo
  • S. Serjeant
  • I. Valtchanov
  • J. D. Vieira
  • P. van der Werf
<mark>Journal publication date</mark>11/09/2016
<mark>Journal</mark>Monthly Notices of the Royal Astronomical Society
Issue number2
Number of pages15
Pages (from-to)1719-1733
Publication StatusPublished
Early online date31/05/16
<mark>Original language</mark>English


We investigate the region around the Planck-detected z = 3.26 gravitationally lensed galaxy HATLAS J114637.9-001132 (hereinafter HATLAS12-00) using both archival Herschel data from the H-ATLAS survey and using submm data obtained with both LABOCA and SCUBA2. The lensed source is found to be surrounded by a strong overdensity of both Herschel-SPIRE sources and submm sources. We detect 17 bright (S870 > ˜7 mJy) sources at >4σ closer than 5 arcmin to the lensed object at 850/870 μm. 10 of these sources have good cross-identifications with objects detected by Herschel-SPIRE which have redder colours than other sources in the field, with 350 μm flux >250 μm flux, suggesting that they lie at high redshift. Submillimeter Array (SMA) observations localise one of these companions to ˜1 arcsec, allowing unambiguous cross identification with a 3.6 and 4.5 μm Spitzer source. The optical/near-IR spectral energy distribution of this source is measured by further observations and found to be consistent with z > 2, but incompatible with lower redshifts. We conclude that this system may be a galaxy cluster/protocluster or larger scale structure that contains a number of galaxies undergoing starbursts at the same time.