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TY - JOUR
T1 - H-ATLAS: a candidate high redshift cluster/protocluster of star-forming galaxies
AU - Clements, D. L.
AU - Braglia, F.
AU - Petitpas, G.
AU - Greenslade, J.
AU - Cooray, A.
AU - Valiante, E.
AU - De Zotti, G.
AU - O'Halloran, B.
AU - Holdship, J.
AU - Morris, B.
AU - Pérez-Fournon, I.
AU - Herranz, D.
AU - Riechers, D.
AU - Baes, M.
AU - Bremer, M.
AU - Bourne, N.
AU - Dannerbauer, H.
AU - Dariush, A.
AU - Dunne, L.
AU - Eales, S.
AU - Fritz, J.
AU - Gonzalez-Nuevo, J.
AU - Hopwood, R.
AU - Ibar, E.
AU - Ivison, R. J.
AU - Leeuw, L. L.
AU - Maddox, S.
AU - Michałowski, M. J.
AU - Negrello, M.
AU - Omont, A.
AU - Oteo, I.
AU - Serjeant, S.
AU - Valtchanov, I.
AU - Vieira, J. D.
AU - Wardlow, J.
AU - van der Werf, P.
PY - 2016/9/11
Y1 - 2016/9/11
N2 - 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.
AB - 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.
KW - galaxies: high redshift
KW - galaxies: starburst
KW - submillimetre: galaxies
U2 - 10.1093/mnras/stw1224
DO - 10.1093/mnras/stw1224
M3 - Journal article
VL - 461
SP - 1719
EP - 1733
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 2
ER -