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The formation history of massive cluster galaxies as revealed by CARLA

Cooke, Elizabeth A.; Hatch, Nina A.; Rettura, A.; Wylezalek, D.; Galametz, A.; Stern, D.; Brodwin, M.; Muldrew, S. I.; Almaini, O.; Conselice, Christopher J.; Eisenhardt, P. R.; Hartley, W. G.; Jarvis, M.; Seymour, N.; Stanford, S. A.

Authors

Elizabeth A. Cooke

NINA HATCH nina.hatch@nottingham.ac.uk
Associate Professor

A. Rettura

D. Wylezalek

A. Galametz

D. Stern

M. Brodwin

S. I. Muldrew

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

Christopher J. Conselice

P. R. Eisenhardt

W. G. Hartley

M. Jarvis

N. Seymour

S. A. Stanford



Abstract

© 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. We use a sample of 37 of the densest clusters and protoclusters across 1.3 ≤ z ≤ 3.2 from the Clusters Around Radio-Loud AGN (CARLA) survey to study the formation of massive cluster galaxies. We use optical i'-band and infrared 3.6 and 4.5 μm images to statistically select sources within these protoclusters and measure their median observed colours; 〈i' - [3.6]〉. We find the abundance of massive galaxies within the protoclusters increases with decreasing redshift, suggesting these objects may form an evolutionary sequence, with the lower redshift clusters in the sample having similar properties to the descendants of the highredshift protoclusters.We find that the protocluster galaxies have an approximately unevolving observed-frame i' -[3.6] colour across the examined redshift range.We compare the evolution of the 〈i' - [3.6]〉 colour of massive cluster galaxies with simplistic galaxy formation models. Taking the full cluster population into account, we show that the formation of stars within the majority of massive cluster galaxies occurs over at least 2 Gyr, and peaks at z ~ 2-3. From the median i' - [3.6] colours, we cannot determine the star formation histories of individual galaxies, but their star formation must have been rapidly terminated to produce the observed red colours. Finally, we show that massive galaxies at z > 2 must have assembled within 0.5 Gyr of them forming a significant fraction of their stars. This means that few massive galaxies in z > 2 protoclusters could have formed via dry mergers.

Journal Article Type Article
Publication Date Sep 21, 2015
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 452
Issue 3
Pages 2318-2336
APA6 Citation Conselice, C. J., Hatch, N. A., Cooke, E. A., Cooke, E. A., Hatch, N. A., Rettura, A., …Stanford, S. A. (2015). The formation history of massive cluster galaxies as revealed by CARLA. Monthly Notices of the Royal Astronomical Society, 452(3), 2318-2336. https://doi.org/10.1093/mnras/stv1413
DOI https://doi.org/10.1093/mnras/stv1413
Keywords galaxies: clusters: general; galaxies: evolution; galaxies: formation; galaxies: high-redshift
Publisher URL http://mnras.oxfordjournals.org/content/452/3/2318
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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