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SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES). IV. Spatial Clustering and Halo Masses of Submillimeter Galaxies

Lim, Chen-Fatt; Chen, Chian-Chou; Smail, Ian; Wang, Wei-Hao; Tee, Wei-Leong; Lin, Yen-Ting; Scott, Douglas; Toba, Yoshiki; Chang, Yu-Yen; Ao, YiPing; Babul, Arif; Bunker, Andy; Chapman, Scott C.; Clements, David L.; Conselice, Christopher J.; Gao, Yu; Greve, Thomas R.; Ho, Luis C.; Hong, Sungwook E.; Hwang, Ho Seong; Koprowski, Maciej; Michałowski, Michał J.; Shim, Hyunjin; Shu, Xinwen; Simpson, James M.

SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES). IV. Spatial Clustering and Halo Masses of Submillimeter Galaxies Thumbnail


Authors

Chen-Fatt Lim

Chian-Chou Chen

Wei-Hao Wang

Wei-Leong Tee

Yen-Ting Lin

Douglas Scott

Yoshiki Toba

Yu-Yen Chang

YiPing Ao

Arif Babul

Andy Bunker

Scott C. Chapman

David L. Clements

Christopher J. Conselice

Yu Gao

Thomas R. Greve

Luis C. Ho

Sungwook E. Hong

Ho Seong Hwang

Maciej Koprowski

Michał J. Michałowski

Hyunjin Shim

Xinwen Shu

James M. Simpson



Abstract

We analyze an extremely deep 450 μm image (1σ = 0.56 mJy beam−1 ) of a ;300 arcmin2 area in the CANDELS/ COSMOS field as part of the Sub-millimeter Common User Bolometric Array-2 Ultra Deep Imaging EAO Survey. We select a robust (signal-to-noise ratio …4) and flux-limited (…4 mJy) sample of 164 submillimeter galaxies (SMGs) at 450 μm that have K-band counterparts in the COSMOS2015 catalog identified from radio or midinfrared imaging. Utilizing this SMG sample and the 4705 K-band-selected non-SMGs that reside within the noise level „1 mJy beam−1 region of the 450 μm image as a training set, we develop a machine-learning classifier using K-band magnitude and color–color pairs based on the 13-band photometry available in this field. We apply the trained machine-learning classifier to the wider COSMOS field (1.6 deg2 ) using the same COSMOS2015 catalog and identify a sample of 6182 SMG candidates with similar colors. The number density, radio and/or mid-infrared detection rates, redshift and stellar-mass distributions, and the stacked 450 μm fluxes of these SMG candidates, from the S2COSMOS observations of the wide field, agree with the measurements made in the much smaller CANDELS field, supporting the effectiveness of the classifier. Using this SMG candidate sample, we measure the two-point autocorrelation functions from z = 3 down to z = 0.5. We find that the SMG candidates reside in halos with masses of ;(2.0 ± 0.5) × 1013 h−1 M☉ across this redshift range. We do not find evidence of downsizing that has been suggested by other recent observational studies.

Citation

Lim, C., Chen, C., Smail, I., Wang, W., Tee, W., Lin, Y., …Simpson, J. M. (2020). SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES). IV. Spatial Clustering and Halo Masses of Submillimeter Galaxies. Astrophysical Journal, 895(2), Article 104. https://doi.org/10.3847/1538-4357/ab8eaf

Journal Article Type Article
Acceptance Date Apr 28, 2020
Online Publication Date Jun 2, 2020
Publication Date 2020-06
Deposit Date Jun 24, 2020
Publicly Available Date Jun 24, 2020
Journal Astrophysical Journal
Print ISSN 0004-637X
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 895
Issue 2
Article Number 104
DOI https://doi.org/10.3847/1538-4357/ab8eaf

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Copyright Statement
© 2020. The American Astronomical Society. All rights reserved.





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