@article{cb6af87a14b94211ae08ffe5ed43d6b4,
title = "SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES): Faint-end Counts at 450 μm",
abstract = "The SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES) is a three-year JCMT Large Program aiming to reach the 450 μm confusion limit in the COSMOS-CANDELS region to study a representative sample of the high-redshift far-infrared galaxy population that gives rise to the bulk of the far-infrared background. We present the first-year data from STUDIES. We reached a 450 μm noise level of 0.91 mJy for point sources at the map center, covered an area of 151 arcmin2, and detected 98 and 141 sources at 4.0σ and 3.5σ, respectively. Our derived counts are best constrained in the 3.5-25 mJy regime using directly detected sources. Below the detection limits, our fluctuation analysis further constrains the slope of the counts down to 1 mJy. The resulting counts at 1-25 mJy are consistent with a power law having a slope of -2.59 (±0.10 for 3.5-25 mJy, and for 1-3.5 mJy). There is no evidence of a faint-end termination or turnover of the counts in this flux density range. Our counts are also consistent with previous SCUBA-2 blank-field and lensing-cluster surveys. The integrated surface brightness from our counts down to 1 mJy is 90.0 ± 17.2 Jy deg-2, which can account for up to of the COBE 450 μm background. We show that Herschel counts at 350 and 500 μm are significantly higher than our 450 μm counts, likely caused by its large beam and source clustering. High angular resolution instruments like SCUBA-2 at 450 μm are therefore highly beneficial for measuring the luminosity and spatial density of high-redshift dusty galaxies.",
keywords = "cosmic background radiation, evolution - submillimeter, galaxies, galaxies - cosmology, high-redshift - galaxies",
author = "Wang, {Wei Hao} and Lin, {Wei Ching} and Lim, {Chen Fatt} and Ian Smail and Chapman, {Scott C.} and Zheng, {Xian Zhong} and Hyunjin Shim and Tadayuki Kodama and Omar Almaini and Yiping Ao and Blain, {Andrew W.} and Nathan Bourne and Bunker, {Andrew J.} and Chang, {Yu Yen} and Chao, {Dani C.Y.} and Chen, {Chian Chou} and Clements, {David L.} and Conselice, {Christopher J.} and Cowley, {William I.} and Helmut Dannerbauer and Dunlop, {James S.} and Geach, {James E.} and Tomotsugu Goto and Linhua Jiang and Ivison, {Rob J.} and Jeong, {Woong Seob} and Kotaro Kohno and Xu Kong and Lee, {Chien Hsu} and Lee, {Hyung Mok} and Minju Lee and Micha{\l}owski, {Micha{\l} J.} and Iv{\'a}n Oteo and Marcin Sawicki and Douglas Scott and Shu, {Xin Wen} and Simpson, {James M.} and Tee, {Wei Leong} and Yoshiki Toba and Elisabetta Valiante and Wang, {Jun Xian} and Ran Wang and Wardlow, {Julie L.}",
note = "Funding Information: We thank the JCMT/EAO staff for the observational support and the data/survey management, Oliver Dor{\'e} and Matthieu B{\'e}thermin for a discussion on the EBL and galaxy evolution models, Li-Yen Hsu for a discussion on the lensed source counts, David Sanders and Jason Chu for providing their local galaxy SED templates, and the anonymous referee for the comments that significantly improve the manuscript. W.H.W., W.C.L., C.F.L., and Y.Y.C. acknowledge support from the Ministry of Science and Technology of Taiwan grant 105-2112-M-001-029-MY3. I.R.S. acknowledges support from STFC (ST/P000541/1), the ERC Advanced Investigator programme DUSTYGAL (321334), and a Royal Society/ Wolfson Merit Award. X.Z.Z. acknowledges support from the National Key R&D Program of China (2017YFA0402703) and NSFC (grant 11773076). J.M.S. acknowledges support from the EACOA Fellowship, and C.C.C. acknowledges support from the ESO Fellowship. W.I.C. acknowledges support from the European Research Council through the award of the Consolidator Grant ID 681627-BUILDUP. H.D. acknowledges support from the Spanish Ministry of Economy and Competitiveness (MINECO) under the 2014 Ram{\'o}n y Cajal program MINECO RYC-2014-15686. M.J.M. acknowledges support from the National Science Centre, Poland through the POLONEZ grant 2015/19/P/ST9/04010 and the European Union{\textquoteright}s Horizon 2020 research and innovation programme under the Marie Sk{\l}odowska-Curie grant agreement No. 665778. R.J.I. and I.O. acknowledge support from the European Research Council in the form of the Advanced Investigator Programme 321302, COSMICISM. X.W.S. acknowledges support from the Chinese NSF through grant 11573001. J.L.W. acknowledges support from a European Union COFUND/Durham Junior Research Fellowship under EU grant agreement number 609412, and additional support from STFC (ST/P000541/1). S.C., M.S., and D.S. acknowledge support from the Natural Sciences and Engineering Research Council (NSERC) of Canada. Funding Information: The James Clerk Maxwell Telescope is operated by the East Asian Observatory on behalf of The National Astronomical Observatory of Japan, Academia Sinica Institute of Astronomy and Astrophysics, the Korea Astronomy and Space Science Institute, the National Astronomical Observatories of China, and the Chinese Academy of Sciences (Grant No. XDB09000000), with additional funding support from the Science and Technology Facilities Council of the United Kingdom and participating universities in the United Kingdom and Canada. Publisher Copyright: {\textcopyright} 2017. The American Astronomical Society..",
year = "2017",
month = nov,
day = "20",
doi = "10.3847/1538-4357/aa911b",
language = "English",
volume = "850",
journal = "Astrophysical Journal",
issn = "0004-637X",
number = "1",
}