H-ATLAS: A Candidate High Redshift Cluster/Protocluster of Star-Forming Galaxies

Dave 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, Malcolm N Bremer, N. Bourne, H. Dannerbauer, A. Dariush, L. Dunne, S. EalesJ. 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, J. Wardlow, P. van der Werf

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Abstract

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 850/870μm. Ten of these sources have good cross-identifications with objects detected by Herschel-SPIRE which have redder colours than other sources in the field, with 350μm flux > 250μm flux, suggesting that they lie at high redshift. Submillimeter Array (SMA) observations localise one of these companions to ∼1 arcsecond, allowing unambiguous cross identification with a 3.6 and 4.5 μm Spitzer source. The optical/near-IR spectral energy distribution (SED) 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.
Original languageEnglish
Pages (from-to)1719-1733
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Volume461
Issue number2
Early online date31 May 2016
DOIs
Publication statusPublished - 11 Sep 2016

Keywords

  • galaxies:starburst
  • submillimetre:galaxies
  • galaxies:high redshift
  • galaxies:clusters

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    Clements, D. L., Braglia, F., Petitpas, G., Greenslade, J., Cooray, A., Valiante, E., De Zotti, G., O'Halloran, B., Holdship, J., Morris, B., Pérez-Fournon, I., Herranz, D., Riechers, D., Baes, M., Bremer, M. N., Bourne, N., Dannerbauer, H., Dariush, A., Dunne, L., ... van der Werf, P. (2016). H-ATLAS: A Candidate High Redshift Cluster/Protocluster of Star-Forming Galaxies. Monthly Notices of the Royal Astronomical Society, 461(2), 1719-1733. https://doi.org/10.1093/mnras/stw1224