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19 April 2024

» arxiv » 1605.6433

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H-ATLAS: A Candidate High Redshift Cluster/Protocluster of Star-Forming Galaxies
D.L. Clements ; F. Braglia ; G. Petitpas ; J. Greenslade ; A. Cooray ; E. Valiante ; G. De Zotti ; B. O'Halloran ; J. Holdship ; B. Morris ; I. Perez-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. Michaowski M. Negrello ; A. Omont ; I.Oteo ; S. Serjeant ; I. Valtchanov ; J.D. Vieira ; J. Wardlow ; P. van der Werf ;
Date:	20 May 2016
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 (S_870 >~7 mJy) sources at >4sigma closer than 5 arcmin to the lensed object at 850/870 microns. 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 350 micron flux > 250 micron 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 micron 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.
Source:	arXiv, 1605.6433
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