Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 461, Issue 2, Pages 1719-1733Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stw1224
Keywords
galaxies: high redshift; galaxies: starburst; submillimetre: galaxies
Categories
Funding
- ESA Member States
- NASA
- Smithsonian Institution
- Academia Sinica
- ESO Telescopes at the La Silla Paranal Observatory [290.A-5043]
- NASA by JPL/Caltech
- ASI/INAF [2014-024-R.0]
- Ministerio de Ciencia e Innovacion [AYA2012-39475-C02-01]
- Spanish MINECO
- Spanish CSIC
- European Social Fund
- CONICYT/FONDECYT [3130504]
- STFC
- European Research Council (ERC), COS-MICISM
- Danish National Research Foundation
- [CSD2010-00064]
- STFC [ST/G001901/1, ST/K001051/1, ST/I005765/1, ST/J001368/1, ST/L001314/1, ST/K000926/1, ST/L000776/1, ST/M000907/1, ST/J001414/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/I005765/1, ST/J001368/1, ST/G001901/1, ST/L001314/1, ST/J001414/1, ST/K004131/1, ST/M000907/1, ST/L000776/1] Funding Source: researchfish
- UK Space Agency [ST/G003874/1, ST/M003558/1, ST/P000568/1, ST/J004812/1, ST/F012373/1, ST/H001239/1] Funding Source: researchfish
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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 (S-870 > similar to 7 mJy) sources at >4 sigma closer than 5 arcmin to the lensed object at 850/870 mu 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 mu m flux > 250 mu m flux, suggesting that they lie at high redshift. Submillimeter Array (SMA) observations localise one of these companions to similar to 1 arcsec, allowing unambiguous cross identification with a 3.6 and 4.5 mu m 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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