The submillimetre view of massive clusters at z ∼ 0.8–1.6

Cooke, EA; Smail, Ian; Stach, SM; Swinbank, AM; Bower, RG; Chen, Chian-Chou; Koyama, Y; Thomson, AP

Abstract

We analyse 850 μm continuum observations of eight massive X-ray detected galaxy clusters at z ∼ 0.8–1.6 taken with SCUBA-2 on the James Clerk Maxwell Telescope. We find an average overdensity of 850 μm-selected sources of a factor of 4 ± 2 per cluster within the central 1 Mpc compared to the field. We investigate the multiwavelength properties of these sources and identify 34 infrared counterparts to 26 SCUBA-2 sources. Their colours suggest that the majority of these counterparts are probable cluster members. We use the multi-wavelength far-infrared photometry to measure the total luminosities and total cluster star-formation rates demonstrating that they are roughly three orders of magnitude higher than local clusters. We predict the H-band luminosities of the descendants of our cluster submillimetre galaxies and find that their stellar luminosity distribution is consistent with that of passive elliptical galaxies in z ∼ 0 clusters. Together, the faded descendants of the passive cluster population already in place at z ∼ 1 and the cluster submillimetre galaxies are able to account for the total luminosity function of early-type cluster galaxies at z ∼ 0. This suggests that the majority of the luminous passive population in z ∼ 0 clusters are likely to have formed at z ≫ 1 through an extreme, dust-obscured starburst event.

Citation

Cooke, E., Smail, I., Stach, S., Swinbank, A., Bower, R., Chen, C., …Thomson, A. (2019). The submillimetre view of massive clusters at z ∼ 0.8–1.6. Monthly Notices of the Royal Astronomical Society, 486(3), 3047-3058. https://doi.org/10.1093/mnras/stz955

• Journal Article Type: Article
• Acceptance Date: Mar 29, 2019
• Online Publication Date: Apr 30, 2019
• Publication Date: Jul 31, 2019
• Deposit Date: Apr 4, 2019
• Publicly Available Date: Apr 26, 2019
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Electronic ISSN: 1365-2966
• Publisher: Royal Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 486
• Issue: 3
• Pages: 3047-3058
• DOI: https://doi.org/10.1093/mnras/stz955
• Public URL: https://durham-repository.worktribe.com/output/1333797