SCUBA-2 overdensities associated with candidate protoclusters selected from Planck data
Monthly Notices of the Royal Astronomical Society, vol. 494, pp. 5985–5991
Abstract
ABSTRACT 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 dusty star-forming galaxy-rich clusters/protoclusters.
Authors 23
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Tianyi Cheng corresponding
Affiliation as printed
Astrophysics Group, Imperial College London, Blackett Laboratory, Prince Consort Road, London SW7 2AZ, UK
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David L. Clements corresponding
Affiliation as printed
Astrophysics Group, Imperial College London, Blackett Laboratory, Prince Consort Road, London SW7 2AZ, UK
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Affiliation as printed
Astrophysics Group, Imperial College London, Blackett Laboratory, Prince Consort Road, London SW7 2AZ, UK
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Affiliation as printed
Astrophysics Group, Imperial College London, Blackett Laboratory, Prince Consort Road, London SW7 2AZ, UK
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Affiliation as printed
European Southern Observatory, Karl-Schwarzschild-Straße 2, D-85748 Garching, Germany
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European Space Agency · European Space Astronomy Centre
Affiliation as printed
European Space Agency / ESAC, Camino Bajo del Castillo, E-28692 Villanueva de la Cañada (Madrid), Spain
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University of California, Irvine
Affiliation as printed
Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA
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Universidad de La Laguna · Instituto de Astrofísica de Canarias
Affiliation as printed
Dpto. Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain
Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain
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Osservatorio Astronomico di Padova
Affiliation as printed
INAF – Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, I-35122 Padova, Italy
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Affiliation as printed
School of Physics and Astronomy, Cardiff University, The Parade, Cardiff CF24 3AA, UK
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Affiliation as printed
Departamento de Física, Universidad de Oviedo, C. Federico García Lorca 18, E-33007 Oviedo, Spain
Instituto Universitario de Ciencias y Tecnologias Espaciales de Asturias (ICTEA), C. Independencia 13, E-33004 Oviedo, Spain
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Affiliation as printed
Instituto de Física y Astronomía, Universidad de Valparaíso, Avda. Gran Bretaña 1111, Valparaíso, Chile
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Affiliation as printed
College of Graduate Studies, University of South Africa, Theo van Wijk 9-52, Unisa Muckleneuk Campus, PO Box 392, UNISA, 0003, South Africa
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University of California, Irvine
Affiliation as printed
Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA
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Adam Mickiewicz University in Poznań
Affiliation as printed
Astronomical Observatory Institute, Faculty of Physics, Adam Mickiewicz University, ul. Słoneczna 36, PL-60-286 Poznań, Poland
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University of California, Irvine
Affiliation as printed
Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA
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Cornell University · Max Planck Institute for Astronomy
Affiliation as printed
Department of Astronomy, Cornell University, Space Sciences Building, Ithaca, NY 14853, USA
Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
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University of British Columbia
Affiliation as printed
Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T1Z1, Canada
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Affiliation as printed
Astrophysics Branch, NASA Ames Research Center, Moffett Field, CA 94035, USA
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Istituto di Radioastronomia di Bologna · University of the Western Cape
Affiliation as printed
Department of Physics and Astronomy, University of the Western Cape, Private Bag X17, Bellville 7535, Cape Town, South Africa
INAF – Istituto di Radioastronomia, via Gobetti 101, I-40129 Bologna, Italy
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European Space Astronomy Centre
Affiliation as printed
Operations Department, Telespazio Vega UK for ESA, European Space Astronomy Centre, E-28691 Villanueva de la Cañada, Spain
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Affiliation as printed
European Southern Observatory, Karl-Schwarzschild-Straße 2, D-85748 Garching, Germany
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University of Groningen · Space Research Organisation Netherlands
Affiliation as printed
Kapteyn Astronomical Institute, University of Groningen, Postbus 800, NL-9700 AV Groningen, the Netherlands
SRON Netherlands Institute for Space Research, Landleven 12, NL-9747 AD Groningen, The Netherlands
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