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

AuthorsClements, D. L.; Zotti, G. de; Pérez-Fournon, I.; Herranz, D. ; Baes, M.; González-Nuevo, J. ; Ivison, R. J.; Maddox, S. J.; Oteo, I.
Galaxies:high redshift
Issue Date2016
PublisherOxford University Press
CitationMonthly Notices of the Royal Astronomical Society 461(2): 1719-1733 (2016)
AbstractWe 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 > ~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.
Publisher version (URL)https://doi.org/10.1093/mnras/stw1224
Identifiersdoi: 10.1093/mnras/stw1224
e-issn: 1365-2966
issn: 0035-8711
Appears in Collections:(IFCA) Artículos
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