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

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 >4? closer than 5 arcmin to the lensed object at 850/870 ?m. 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 ?m flux >250 ?m 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 ?mSpitzer 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.

 Autoría: 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. González-Nuevo, R. Hopwood, E. Ibar, R. J. Ivison, L. L. Leeuw, S. Maddox, M. J. Michatowski, M. Negrello, A. Omont, I. Oteo,17, S. Serjeant, I. Valtchanov, J. D. Vieira, J. Wardlow and P. van der Werf

 Fuente: MNRAS 461, 1719-1733 (2016)

 Editorial: Oxford University Press

 Fecha de publicación: 01/09/2016

 Nº de páginas: 15

 Tipo de publicación: Artículo de Revista

 DOI: 10.1093/mnras/stw1224

 ISSN: 0035-8711,1365-2966

 Proyecto español: AYA2012-39475-C02-01

 Url de la publicación: https://doi.org/10.1093/mnras/stw1224