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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.

Authors

C. J. Conselice

W. G. Hartley

E. A. Cooke

S. I. Muldrew

N. A. Hatch

Stuart I. Muldrew

Elizabeth A. Cooke

William G. Hartley

OMAR ALMAINI omar.almaini@nottingham.ac.uk
Professor of Astrophysics

C. J. Simpson

Christopher J. Conselice



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., …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 Mar 29, 2024
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.

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