NEPSC2, the North Ecliptic Pole SCUBA-2 survey: 850-μm map and catalogue of 850-μm-selected sources over 2 deg2. Issue 4 (27th August 2020)

• Record Type: Journal Article
• Authors: Shim, Hyunjin; Kim, Yeonsik; Lee, Dongseob; Lee, Hyung Mok; Goto, Tomo; Matsuhara, Hideo; Scott, Douglas; Serjeant, Stephen; Ao, Yiping; Barrufet, Laia; Chapman, Scott; Clements, David L; Conselice, Christopher J; Greve, Thomas R; Hashimoto, Tetsuya; Hwang, Ho Seong; Im, Myungshin; Jeong, Woong-Seob; Jiang, Linhua; Kim, Minjin; Kim, Seong Jin; Kong, Albert K H; Koprowski, Maciej; Marchetti, Lucia; Michałowski, Michał J; Parsons, Harriet; Pearson, Chris; Seo, Hyunjong; Toba, Yoshiki; White, Glenn
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 498:Issue 4(2020)
• Page Start: 5065
• Page End: 5079
• Publication Date: 2020-08-27
• Subjects: galaxies: evolution -- galaxies: photometry -- galaxies: starburst -- submillimetre: galaxies; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/staa2621
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: We present an 850- μ m mosaic map and extracted catalogue of submillimetre sources in the extended North Ecliptic Pole (NEP) region over about 2 deg 2 . The 850- μ m map is constructed using newly obtained observations by SCUBA-2 at the East Asian Observatory's James Clerk Maxwell Telescope, carried out using the observatory's large programme opportunities. The recent 850- μ m survey has extended the submillimetre data coverage by almost a factor of 4 compared to previous surveys, with a depth of $\sigma _\text{rms}\, {=}\, 1.0$ –$2.3\, {\rm mJy}\, {\rm beam}^{-1}$ . The catalogue contains 549 sources selected above a significance level of 4σ, where the false-detection rate is 10 per cent; a higher threshold of 4.5σ is required in order to achieve a false-detection rate below 3 per cent, which results in 342 sources being selected. Despite the large spatial variation of the noise, the deboosted flux density of sources is comparable to results from the SCUBA-2 Cosmology Legacy Survey, which covered the central 0.6 deg 2 of our survey area with better sensitivity. We construct the source counts at 850 μ m, finding results in agreement with other 850- μ m surveys in cosmological blank fields over S 850 = 4–15 mJy. We find a slight excess of bright galaxies ($S_{850}\, {\gt }\, 15$ mJy), which can be considered to be at $z_\text{phot}\, {=}\, 2$ –4. The 850- μ m data add valuable long-wavelength information to mid-infrared-selected sources from the AKARI NEP-deep and NEP-wide surveys, which will be helpful in preparing for future near-infrared to millimetre wavelength observations in the NEP region. Our 850- μ m mosaic map and source catalogue will be made publicly available.