Chen-Fatt Lim
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.
Authors
Chian-Chou Chen
Professor Ian Smail ian.smail@durham.ac.uk
Emeritus Professor
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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