Candidate high-z proto-clusters among the Planck compact sources, as revealed by Herschel-SPIRE

Abstract

By determining the nature of all the Planck compact sources within 808.4 deg^2 of large Herschel surveys, we have identified 27 candidate proto-clusters of dusty star forming galaxies (DSFGs) that are at least 3σ overdense in either 250, 350 or 500 $\mu$mm sources. We find roughly half of all the Planck compact sources are resolved by Herschel into multiple discrete objects, with the other half remaining unresolved by Herschel. We find a significant difference between versions of the Planck catalogues, with earlier releases hosting a larger fraction of candidate proto-clusters and Galactic Cirrus than later releases, which we ascribe to a difference in the filters used in the creation of the three catalogues. We find a surface density of DSFG candidate proto-clusters of (3.3 $\pm$ 0.7) x 10^(-2) sources deg^(-2), in good agreement with previous similar studies. We find that a Planck colour selection of S_{857}/S_{545} < 2 works well to select candidate proto-clusters, but can miss proto-clusters at z < 2. The Herschel colours of individual candidate proto-cluster members indicate our candidate proto-clusters all likely all lie at z > 1. Our candidate proto-clusters are a factor of 5 times brighter at 353 GHz than expected from simulations, even in the most conservative estimates. Further observations are needed to confirm whether these candidate proto-clusters are physical clusters, multiple proto-clusters along the line of sight, or chance alignments of unassociated sources.

Resubmitted to MNRAS after request for minor revision

References in corpus (17)

• A Cosmological Framework for the Co-Evolution of Quasars, Supermassive Black Holes, and Elliptical Galaxies: I. Galaxy Mergers & Quasar Activity
• A massive proto-cluster of galaxies at a redshift of z {\approx} 5.3
• A GMBCG Galaxy Cluster Catalog of 55,424 Rich Clusters from SDSS DR7
• The Herschel-ATLAS Data Release 1 Paper I: Maps, Catalogues and Number Counts
• An excess of dusty starbursts related to the Spiderweb galaxy
• The Herschel-ATLAS: a sample of 500μm-selected lensed galaxies over 600 square degrees
• The space density of luminous dusty star-forming galaxies at $z>4$: SCUBA-2 and LABOCA imaging of ultrared galaxies from $Herschel$-ATLAS
• Herschel images of Fomalhaut. An extrasolar Kuiper Belt at the height of its dynamical activity
• Molecular Gas in the Halo Fuels the Growth of a Massive Cluster Galaxy at High Redshift
• Large turbulent reservoirs of cold molecular gas around high-redshift starburst galaxies
• Simulated observations of sub-millimetre galaxies: the impact of single-dish resolution and field variance
• KECK/MOSFIRE spectroscopic confirmation of a Virgo-like cluster ancestor at z=2.095
• Comparison of filters for the detection of point sources in Planck simulations
• The early phases of galaxy clusters formation in IR: coupling hydrodynamical simulations with GRASIL3D
• Herschel's view into Mira's head
• ALMACAL II: Extreme star-formation-rate densities in a pair of dusty starbursts at $z=3.442$ revealed by ALMA 20-milliarcsec resolution imaging
• Extinction and nebular line properties of a Herschel-selected lensed dusty starburst AT z=1.027

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• Planck far-infrared detection of Hyper Suprime-Cam protoclusters at $\mathbf{z}\sim 4$: hidden AGN and star formation activity
• Rapid build-up of the stellar content in the protocluster core SPT2349$-$56 at $z=4.3$
• SCUBA-2 observations of candidate starbursting protoclusters selected by Planck and Herschel-SPIRE
• Candidate high-redshift protoclusters and lensed galaxies in the Planck list of high-z sources overlapping with Herschel-SPIRE imaging
• Questioning Planck-selected star-forming high-redshift galaxy protoclusters and their fate
• Probing the Mpc-scale environment of hyperluminous infrared galaxies at 2<z<4
• Connecting the growth of galaxies to the large-scale environment in a massive node of the Cosmic Web at z~3
• Galaxy populations of ProtoClusters in cosmological hydrodynamical simulations
• A SCUBA-2 Selected Herschel-SPIRE Dropout and the Nature of this Population
• SCUBA-2 overdensities associated with candidate protoclusters selected from Planck data
• Gas properties as a function of environment in the proto-supercluster Hyperion at z ~ 2.45
• Tracing the Total Stellar Mass and Star Formation of High-Redshift Protoclusters
• Euclid preparation. Exploring the properties of proto-clusters in the Simulated Euclid Wide Survey
• Morphology of relaxed and merging galaxy clusters. Analytical models for monolithic Minkowski functionals
• Multifrequency filter search for high redshift sources and lensing systems in Herschel-ATLAS
• Extragalactic astrophysics with next-generation CMB experiments