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Faint Submillimeter Galaxies Identified through Their Optical/Near-infrared Colors. I. Spatial Clustering and Halo Masses

Chen, C.-C.; Smail, I.; Swinbank, A.M.; Simpson, J.M.; Almaini, O.; Conselice, C.J.; Hartley, W.G.; Mortlock, A.; Simpson, C.; Wilkinson, A.

Faint Submillimeter Galaxies Identified through Their Optical/Near-infrared Colors. I. Spatial Clustering and Halo Masses Thumbnail


Authors

C.-C. Chen

J.M. Simpson

O. Almaini

C.J. Conselice

W.G. Hartley

A. Mortlock

C. Simpson

A. Wilkinson



Abstract

The properties of submillimeter galaxies (SMGs) that are fainter than the confusion limit of blank-field single-dish surveys (S850≲ 2 mJy) are poorly constrained. Using a newly developed color selection technique, Optical-Infrared Triple Color (OIRTC), that has been shown to successfully {select} such faint SMGs, we identify a sample of 2938 OIRTC-selected galaxies, dubbed Triple Color Galaxies (TCGs), in the UKIDSS-UDS field. We show that these galaxies have a median 850 μm flux of S850=0.96±0.04 mJy (equivalent to a star-formation rate SFR ∼60−100 M⊙ yr−1 based on SED fitting), representing the first large sample of faint SMGs that bridges the gap between bright SMGs and normal star-forming galaxies in S850 and LIR. We assess the basic properties of TCGs and their relationship with other galaxy populations at z∼2. We measure the two-point autocorrelation function for this population and derive a typical halo mass of log10(Mhalo) =12.9+0.2−0.3, 12.7+0.1−0.2, and 12.9+0.2−0.3 h−1M⊙ at z=1−2, 2−3, and 3−5, respectively. Together with the bright SMGs (S850≳2 mJy) and a comparison sample of less far-infrared luminous star-forming galaxies, we find a lack of dependence between spatial clustering and S850 (or SFR), suggesting that the difference between these populations may lie in their local galactic environment. Lastly, on the scale of ∼8−17 kpc at 1

Citation

Chen, C., Smail, I., Swinbank, A., Simpson, J., Almaini, O., Conselice, C., …Wilkinson, A. (2016). Faint Submillimeter Galaxies Identified through Their Optical/Near-infrared Colors. I. Spatial Clustering and Halo Masses. Astrophysical Journal, 831(1), Article 91. https://doi.org/10.3847/0004-637x/831/1/91

Journal Article Type Article
Acceptance Date Aug 13, 2016
Online Publication Date Oct 28, 2016
Publication Date Nov 1, 2016
Deposit Date Feb 22, 2017
Publicly Available Date Mar 9, 2017
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 831
Issue 1
Article Number 91
DOI https://doi.org/10.3847/0004-637x/831/1/91
Public URL https://durham-repository.worktribe.com/output/1362795
Related Public URLs https://arxiv.org/abs/1609.00388

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Copyright Statement
© 2016. The American Astronomical Society. All rights reserved.






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