The East Asian Observatory SCUBA-2 Survey of the COSMOS Field: Unveiling 1147 Bright Sub-millimeter Sources across 2.6 Square Degrees

Simpson, J.M.; Smail, Ian; Swinbank, A.M.; Chapman, S.C.; Chen, Chian-Chou; Geach, J.E.; Matsuda, Y.; Wang, R.; Wang, Wei-Hao; Yang, Y.; Ao, Y.; Asquith, R.; Bourne, N.; Coogan, R.T.; Coppin, K.; Gullberg, B.; Hine, N.K.; Ho, L.C.; Hwang, H.S.; Ivison, R.J.; Kato, Y.; Lacaille, K.; Lewis, A.J.R.; Liu, D.; Michałowski, M.J.; Oteo, I.; Sawicki, M.; Scholtz, J.; Smith, D.; Thomson, A.P.; Wardlow, J.L.

Abstract

We present sensitive 850 μm imaging of the Cosmological Evolution Survey (COSMOS) field using 640 hr of new and archival observations taken with SCUBA-2 at the East Asian Observatory's James Clerk Maxwell Telescope. The SCUBA-2 COSMOS survey (S2COSMOS) achieves a median noise level of σ 850μm = 1.2 mJy beam−1 over an area of 1.6 sq. degree (main; Hubble Space Telescope/Advanced Camera for Surveys footprint), and σ 850μm = 1.7 mJy beam−1 over an additional 1 sq. degree of supplementary (supp) coverage. We present a catalog of 1020 and 127 sources detected at a significance level of >4σ and >4.3σ in the main and supp regions, respectively, corresponding to a uniform 2% false-detection rate. We construct the single-dish 850 μm number counts at S 850 > 2 mJy and show that these S2COSMOS counts are in agreement with previous single-dish surveys, demonstrating that degree-scale fields are sufficient to overcome the effects of cosmic variance in the S 850 = 2–10 mJy population. To investigate the properties of the galaxies identified by S2COSMOS sources we measure the surface density of near-infrared-selected galaxies around their positions and identify an average excess of 2.0 ± 0.2 galaxies within a 13'' radius (~100 kpc at z ~ 2). The bulk of these galaxies represent near-infrared-selected submillimeter galaxies and/or spatially correlated sources and lie at a median photometric redshift of z = 2.0 ± 0.1. Finally, we perform a stacking analysis at submillimeter and far-infrared wavelengths of stellar-mass-selected galaxies (M sstarf = 1010–1012 M ⊙) from z = 0–4, obtaining high-significance detections at 850 μm in all subsets (signal-to-noise ratio, S/N = 4–30), and investigate the relation between far-infrared luminosity, stellar mass, and the peak wavelength of the dust spectral energy distribution. The publication of this survey adds a new deep, uniform submillimeter layer to the wavelength coverage of this well-studied COSMOS field.

Citation

Simpson, J., Smail, I., Swinbank, A., Chapman, S., Chen, C.-C., Geach, J., Matsuda, Y., Wang, R., Wang, W.-H., Yang, Y., Ao, Y., Asquith, R., Bourne, N., Coogan, R., Coppin, K., Gullberg, B., Hine, N., Ho, L., Hwang, H., Ivison, R., …Wardlow, J. (2019). The East Asian Observatory SCUBA-2 Survey of the COSMOS Field: Unveiling 1147 Bright Sub-millimeter Sources across 2.6 Square Degrees. Astrophysical Journal, 880(1), Article 43. https://doi.org/10.3847/1538-4357/ab23ff

• Journal Article Type: Article
• Acceptance Date: May 16, 2019
• Online Publication Date: Jul 23, 2019
• Publication Date: Jul 31, 2019
• Deposit Date: Aug 8, 2019
• Publicly Available Date: Aug 8, 2019
• Journal: Astrophysical Journal
• Print ISSN: 0004-637X
• Publisher: American Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 880
• Issue: 1
• Article Number: 43
• DOI: https://doi.org/10.3847/1538-4357/ab23ff
• Public URL: https://durham-repository.worktribe.com/output/1296221