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

Clements, D. L. and Braglia, F. and Petitpas, G. and Greenslade, J. and Cooray, A. and Valiante, E. and De Zotti, G. and O'Halloran, B. and Holdship, J. and Morris, B. and Pérez-Fournon, I. and Herranz, D. and Riechers, D. and Baes, M. and Bremer, M. and Bourne, N. and Dannerbauer, H. and Dariush, A. and Dunne, L. and Eales, S. and Fritz, J. and Gonzalez-Nuevo, J. and Hopwood, R. and Ibar, E. and Ivison, R. J. and Leeuw, L. L. and Maddox, S. and Michałowski, M. J. and Negrello, M. and Omont, A. and Oteo, I. and Serjeant, S. and Valtchanov, I. and Vieira, J. D. and Wardlow, J. and 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). pp. 1719-1733. ISSN 0035-8711

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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.

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Journal Article
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Monthly Notices of the Royal Astronomical Society
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08 Nov 2018 14:50
Last Modified:
15 Sep 2023 00:48