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Dusty starbursts and the formation of elliptical galaxies: A SCUBA-2 survey of a z = 1.46 cluster

Ma, C.-J.; Smail, I.; Swinbank, A.M.; Simpson, J.M.; Thomson, A.P.; Chen, C.-C.; Danielson, A.L.R.; Hilton, M.; Tadaki, K.; Stott, J.; Kodama, T.

Dusty starbursts and the formation of elliptical galaxies: A SCUBA-2 survey of a z = 1.46 cluster Thumbnail


C.-J. Ma

J.M. Simpson

A.P. Thomson

C.-C. Chen

A.L.R. Danielson

M. Hilton

K. Tadaki

J. Stott

T. Kodama


We report the results of a deep SCUBA-2 850 and 450 μm survey for dust-obscured ultra-/luminous infrared galaxies (U/LIRGs) in the field of the z = 1.46 cluster XCS J2215.9−1738. We detect a striking overdensity of submillimeter sources coincident with the core of this cluster: ~3–4 × higher than expected in a blank field. We use the likely radio and mid-infrared counterparts to show that the bulk of these submillimeter sources have spectroscopic or photometric redshifts that place them in the cluster and that their multiwavelength properties are consistent with this association. The average far-infrared luminosities of these galaxies are (1.0 ± 0.1) × 1012 ${L}_{\odot }$, placing them on the U/LIRG boundary. Using the total star formation occurring in the obscured U/LIRG population within the cluster, we show that the resulting mass-normalized star formation rate for this system supports previous claims of a rapid increase in star formation activity in cluster cores out to $z\sim 1.5$, which must be associated with the ongoing formation of the early-type galaxies that reside in massive clusters today.

Journal Article Type Article
Publication Date Jun 20, 2015
Deposit Date Jul 14, 2015
Publicly Available Date Jul 23, 2015
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 806
Issue 2
Article Number 257
Keywords Galaxies: clusters: individual (XMMXCS J2215.9–1738), Galaxies: evolution, Galaxies: formation.
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Published Journal Article (2.6 Mb)

Copyright Statement
© 2015. The American Astronomical Society. All rights reserved.

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