SCUBA-2 follow-up of Herschel-SPIRE observed Planck overdensities

Abstract

We present SCUBA-2 follow-up of 61 candidate high-redshift Planck sources. Of these, 10 are confirmed strong gravitational lenses and comprise some of the brightest such submm sources on the observed sky, while 51 are candidate proto-cluster fields undergoing massive starburst events. With the accompanying Herschel-SPIRE observations and assuming an empirical dust temperature prior of $34_{-9}^{+13}$ K, we provide photometric redshift and far-IR luminosity estimates for 172 SCUBA-2-selected sources within these Planck overdensity fields. The redshift distribution of the sources peak between a redshift of 2 and 4, with one third of the sources having $S_{500}$/$S_{350}>1$. For the majority of the sources, we find far-IR luminosities of approximately $10^{13}{\mathrm{L}}_{\odot }$, corresponding to star-formation rates of around $1000$ M${}_{\odot }{\mathrm{yr}}^{-1}$. For $S_{850}>8$ mJy sources, we show that there is up to an order of magnitude increase in star-formation rate density and an increase in uncorrected number counts of $6$ for $S_{850}>8$ mJy when compared to typical cosmological survey fields. The sources detected with SCUBA-2 account for only approximately $5$ per cent of the Planck flux at 353 GHz, and thus many more fainter sources are expected in these fields.

13 pages, 5 figures, 1 table

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• Candidate high-redshift protoclusters and lensed galaxies in the Planck list of high-z sources overlapping with Herschel-SPIRE imaging
• ALMACAL. XI. Over-densities as signposts to proto-clusters? A cautionary tale
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• A machine learning approach for identifying the counterparts of submillimetre galaxies and applications to the GOODS-North field
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• An ALMA spectroscopic survey of the Planck high-redshift object PLCK G073.4-57.5 confirms two protoclusters
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