Y. Koyama
Massive starburst galaxies in a z = 2.16 proto-cluster unveiled by panoramic Hα mapping
Koyama, Y.; Kodama, T.; Tadaki, K.-i; Hayashi, M.; Tanaka, M.; Smail, I.; Tanaka, I.; Kurk, J.
Authors
T. Kodama
K.-i Tadaki
M. Hayashi
M. Tanaka
Ian Smail ian.smail@durham.ac.uk
Emeritus Professor
I. Tanaka
J. Kurk
Abstract
We present a panoramic narrow-band study of Hα emitters in the field of the z = 2.16 proto-cluster around PKS 1138−262 using MOIRCS on the Subaru Telescope. We find 83 Hα emitters down to a star formation rate of SFR (Hα) ∼ 10 M⊙ yr−1 across a ∼ 7 × 7 arcmin2 region centred on the radio galaxy, and identify ∼10-Mpc scale filaments of emitters running across this region. By examining the properties of Hα emitters within the large-scale structure, we find that galaxies in the higher density environments at z = 2.16 tend to have redder colours and higher stellar masses compared to galaxies in more underdense regions. We also find a population of Hα emitters with red colours [(J − Ks) ≳ 1], which are much more frequent in the denser environments and which have apparently very high stellar masses with M* ≳ 1011 M⊙, implying that these cluster galaxies have already formed a large part of their stellar mass before z ∼ 2. Spitzer Space Telescope 24-μm data suggest that many of these red Hα emitters are bright, dusty starbursts (rather than quiescent sources). We also find that the proto-cluster galaxies follow the same correlation between SFR and M* (the ‘main sequence’) of z ∼ 2 field star-forming galaxies, but with an excess of massive galaxies. These very massive star-forming galaxies are not seen in our similar, previous study of z ∼ 1 clusters, suggesting that their star formation activity has been shut off at 1 ≲ z ≲ 2. We infer that the massive red (but active) galaxies in this rich proto-cluster are likely to be the products of environmental effects, and they represent the accelerated galaxy formation and evolution in a biased high-density region in the early Universe.
Citation
Koyama, Y., Kodama, T., Tadaki, K., Hayashi, M., Tanaka, M., Smail, I., …Kurk, J. (2013). Massive starburst galaxies in a z = 2.16 proto-cluster unveiled by panoramic Hα mapping. Monthly Notices of the Royal Astronomical Society, 428(2), 1551-1564. https://doi.org/10.1093/mnras/sts133
Journal Article Type | Article |
---|---|
Publication Date | Jan 1, 2013 |
Deposit Date | May 10, 2013 |
Publicly Available Date | Jun 19, 2014 |
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 | 428 |
Issue | 2 |
Pages | 1551-1564 |
DOI | https://doi.org/10.1093/mnras/sts133 |
Keywords | Galaxies: clusters: individual: PKS 1138−262, Galaxies: evolution, Large-scale structure of Universe |
Public URL | https://durham-repository.worktribe.com/output/1456537 |
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Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society © 2013 The Authors Published by Oxford University Press on behalf of Royal Astronomical Society. All rights reserved.
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