The structure and evolution of a forming galaxy cluster at z = 1.62

J. Conselice, C.; G. Hartley, W.; A. Cooke, E.; I. Muldrew, S.; A. Hatch, N.; Hatch, Nina A.; Muldrew, Stuart I.; Cooke, Elizabeth A.; Hartley, William G.; Almaini, O.; J. Simpson, C.; Conselice, Christopher J.

Abstract

We present a comprehensive picture of the Cl0218.3-0510 protocluster at $z=1.623$ across 10 co-moving Mpc. Using filters that tightly bracket the Balmer and 4000 Angstrom breaks of the protocluster galaxies we obtain precise photometric redshifts resulting in a protocluster galaxy sample that is 89+/-5% complete and has a contamination of only 12+/-5%. Both star forming and quiescent protocluster galaxies are located allowing us to map the structure of the forming cluster for the first time. The protocluster contains 6 galaxy groups, the largest of which is the nascent cluster. Only a small minority of the protocluster galaxies are in the nascent cluster (11%) or in the other galaxy groups (22%), as most protocluster galaxies reside between the groups. Unobscured star forming galaxies predominantly reside between the protocluster's groups, whereas red galaxies make up a large fraction of the groups' galactic content, so observing the protocluster through only one of these types of galaxies results in a biased view of the protocluster's structure. The structure of the protocluster reveals how much mass is available for the future growth of the cluster and we use the Millennium Simulation, scaled to a Planck cosmology, to predict that Cl0218.3-0510 will evolve into a 2.7x 10^14 Msun cluster by the present day.

Citation

J. Conselice, C., G. Hartley, W., A. Cooke, E., I. Muldrew, S., A. Hatch, N., Hatch, N. A., Muldrew, S. I., Cooke, E. A., Hartley, W. G., Almaini, O., J. Simpson, C., & Conselice, C. J. (2016). The structure and evolution of a forming galaxy cluster at z = 1.62. Monthly Notices of the Royal Astronomical Society, 459(1), 387-401. https://doi.org/10.1093/mnras/stw602

• Journal Article Type: Article
• Acceptance Date: Mar 10, 2016
• Online Publication Date: Mar 15, 2016
• Publication Date: Jun 11, 2016
• Deposit Date: Jul 11, 2016
• Publicly Available Date: Jul 11, 2016
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Electronic ISSN: 1365-2966
• Publisher: Oxford University Press
• Peer Reviewed: Peer Reviewed
• Volume: 459
• Issue: 1
• Pages: 387-401
• DOI: https://doi.org/10.1093/mnras/stw602
• Keywords: Astrophysics of Galaxies; Cosmology and Nongalactic Astrophysics
• Public URL: https://nottingham-repository.worktribe.com/output/780333
• Publisher URL: http://mnras.oxfordjournals.org/content/459/1/387
• Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
• Contract Date: Jul 11, 2016