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

Autor(en): David L. Clements, F. Braglia, G. Petitpas, J. Greenslade, Asantha R. Cooray, Helmut Dannerbauer
Abstrakt: 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.
Organisation(en): Institut für Astrophysik
Externe Organisation(en): Imperial College London, Submillimeter Array, Hilo, University of California, Irvine
Journal: Monthly Notices of the Royal Astronomical Society
Band: 461
Seiten: 1719 - 1733
Anzahl der Seiten: 15
ISSN: 0035-8711
DOI: https://doi.org/10.1093/mnras/stw1224
Publikationsdatum: 09-2016
Peer-reviewed: Ja
ÖFOS 2012: 103003 Astronomie, 103004 Astrophysik
Schlagwörter
ASJC Scopus Sachgebiete: Astronomy and Astrophysics, Space and Planetary Science
Link zum Portal: https://ucrisportal.univie.ac.at/de/publications/eed9b663-7402-453b-be1e-8f3dd3fa7507

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