H-ATLAS: A Candidate High Redshift Cluster/Protocluster of Star-Forming Galaxies
File(s)
Accepted version
Published version
Author(s)
Type
Journal Article
Abstract
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 850/870µm. Ten of these sources have good cross-identifications with objects detected
by Herschel-SPIRE which have redder colours than other sources in the field,
with 350µm flux > 250µm flux, suggesting that they lie at high redshift. Submillimeter
Array (SMA) observations localise one of these companions to ∼1 arcsecond,
allowing unambiguous cross identification with a 3.6 and 4.5 µm Spitzer source. The
optical/near-IR spectral energy distribution (SED) 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.
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 850/870µm. Ten of these sources have good cross-identifications with objects detected
by Herschel-SPIRE which have redder colours than other sources in the field,
with 350µm flux > 250µm flux, suggesting that they lie at high redshift. Submillimeter
Array (SMA) observations localise one of these companions to ∼1 arcsecond,
allowing unambiguous cross identification with a 3.6 and 4.5 µm Spitzer source. The
optical/near-IR spectral energy distribution (SED) 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.
Date Issued
2016-05-31
Date Acceptance
2016-05-20
Citation
Monthly Notices of the Royal Astronomical Society, 2016, 461 (2), pp.1719-1733
ISSN
1365-2966
Publisher
Wiley
Start Page
1719
End Page
1733
Journal / Book Title
Monthly Notices of the Royal Astronomical Society
Volume
461
Issue
2
Copyright Statement
© 2016 The Authors
Published by Oxford University Press on behalf of the Royal Astronomical Society
Published by Oxford University Press on behalf of the Royal Astronomical Society
Sponsor
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Grant Number
SPIRE/SOW/07020F
ST/F012373/1
ST/H001239/1
ST/G001901/1
ST/G003874/1
ST/I005765/1
ST/J004812/1
ST/J001368/1
ST/L001314/1
ST/K006401/1
ST/K004131/1
ST/M003558/1
ST/P000568/1
Subjects
Science & Technology
Physical Sciences
Astronomy & Astrophysics
galaxies: high redshift
galaxies: starburst
submillimetre: galaxies
SPECTRAL ENERGY-DISTRIBUTIONS
SCIENCE DEMONSTRATION PHASE
HERSCHEL-ATLAS
SUBMILLIMETER GALAXIES
MOLECULAR GAS
SOURCE EXTRACTION
DUSTY STARBURSTS
LENSED GALAXIES
PROTO-CLUSTER
DEEP FIELD
0201 Astronomical And Space Sciences
Publication Status
Published