SCUBA-2 overdensities associated with candidate protoclusters selected from Planck data
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2020
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Royal Astronomical Society
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We measure the 850-μm source densities of 46 candidate protoclusters selected
from the Planck High-z catalogue (PHz) and the Planck Catalogue of Compact Sources
(PCCS) that were followed up with Herschel -SPIRE and SCUBA-2. This paper aims
to search for overdensities of 850-μm sources in order to select the fields that are
most likely to be genuine protoclusters. Of the 46 candidate protoclusters, 25 have
significant overdensities (>5 times the field counts), 11 have intermediate overdensities
(3–5 times the field counts) and 10 have no overdensity (<3 times the field counts)
of 850-μm sources. We find that the enhanced number densities are unlikely to be
the result of sample variance. Compared with the number counts of another sample
selected from Planck’s compact source catalogues, this [PHz+PCCS]-selected sample
has a higher fraction of candidate protoclusters with significant overdensities, though
both samples show overdensities of 850-μm sources above intermediate level. Based
on the estimated star-formation rate densities (SFRDs), we suggest that both samples
can efficiently select protoclusters with starbursting galaxies near the redshift at which
the global field SFRD peaks (2 < z < 3). Based on the confirmation of overdensities
found here, future follow-up observations on other PHz targets may greatly increase
the number of genuine DSFG-rich clusters/protoclusters.
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GALAXIES: HIGH-REDSHIFT, GALAXIES: STARBURST, SUBMILLIMETRE: GALAXIES