The SCUBA-2 Large eXtragalactic Survey: 850μm map, catalogue and the bright-end number counts of the<i>XMM-</i>LSS field

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  • T K Garratt
    Centre for Astrophysics Research, University of Hertfordshire , Hatfield AL10 9AB, UK
  • J E Geach
    Centre for Astrophysics Research, University of Hertfordshire , Hatfield AL10 9AB, UK
  • Y Tamura
    Division of Particle and Astrophysical Science, Nagoya University , Nagoya, Aichi 464-8602, Japan
  • K E K Coppin
    Centre for Astrophysics Research, University of Hertfordshire , Hatfield AL10 9AB, UK
  • M Franco
    Centre for Astrophysics Research, University of Hertfordshire , Hatfield AL10 9AB, UK
  • Y Ao
    Purple Mountain Observatory and Key Laboratory for Radio Astronomy, Chinese Academy of Sciences , 10 Yuanhua Road, Nanjing 210023, China
  • C -C Chen
    Academia Sinica Institute of Astronomy and Astrophysics , No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan
  • C Cheng
    Chinese Academy of Sciences South America Center for Astronomy, National Astronomical Observatories, CAS , Beijing 100101, China
  • D L Clements
    Imperial College London, Blackett Lab , Prince Consort Road, London SW7 2AZ, UK
  • Y S Dai
    Chinese Academy of Sciences South America Center for Astronomy, National Astronomical Observatories, CAS , Beijing 100101, China
  • H Dannerbauer
    Instituto de Astrofísica de Canarias (IAC) , E-38205 La Laguna, Tenerife, Spain
  • T R Greve
    National Space Institute, DTU Space, Technical University of Denmark , Elektrovej 327, DK-2800 Kgs. Lyngby, Denmark
  • B Hatsukade
    Institute of Astronomy, Graduate School of Science, The University of Tokyo , 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan
  • H S Hwang
    Astronomy Program, Department of Physics and Astronomy, Seoul National University , 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
  • L Jiang
    Kavli Institute for Astronomy and Astrophysics, Peking University , No. 5 Yiheyuan Road, Haidian District, Beijing 100871, China
  • K Kohno
    Institute of Astronomy, Graduate School of Science, The University of Tokyo , 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan
  • M P Koprowski
    Institute of Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University , Grudziadzka 5, PL-87-100 Torun, Poland
  • M J Michałowski
    Astronomical Observatory Institute, Faculty of Physics, Adam Mickiewicz University , ul. Słoneczna 36, PL-60-286 Poznań, Poland
  • M Sawicki
    Department of Astronomy and Physics, and Institute for Computational Astrophysics, Saint Mary’s University , Halifax, NS B3H 3C3, Canada
  • D Scott
    Department of Physics and Astronomy, University of British Columbia , Vancouver, BC V6T 1Z1, Canada
  • H Shim
    Department of Earth Science Education, Kyungpook National University , Daegu 41566, Republic of Korea
  • T T Takeuchi
    Division of Particle and Astrophysical Science, Nagoya University , Nagoya, Aichi 464-8602, Japan
  • W -H Wang
    Academia Sinica Institute of Astronomy and Astrophysics , No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan
  • Y Q Xue
    School of Astronomy and Space Science, University of Science and Technology of China , Hefei 230026, Anhui, China
  • C Yang
    Department of Space, Earth and Environment, Chalmers University of Technology , Göteborg, 412 58, Sweden

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<jats:title>ABSTRACT</jats:title><jats:p>We present $850\, \mu {\rm m}$ imaging of the XMM-LSS field observed for 170 h as part of the James Clerk Maxwell Telescope SCUBA-2 Large eXtragalactic Survey (S2LXS). S2LXS XMM-LSS maps an area of $9\, {\rm deg}^2$, reaching a moderate depth of $1\sigma \simeq 4\, {\rm mJy\, beam^{-1}}$. This is the largest contiguous area of extragalactic sky mapped by James Clerk Maxwell Telescope (JCMT) at $850\, \mu {\rm m}$ to date. The wide area of the S2LXS XMM-LSS survey allows us to probe the ultra-bright ($S_{\rm 850\mu m}\gtrsim 15\, {\rm mJy}$), yet rare submillimetre population. We present the S2LXS XMM-LSS catalogue, which comprises 40 sources detected at &gt;5σ significance, with deboosted flux densities in the range of $7$–$48\, {\rm mJy}$. We robustly measure the bright-end of the $850\, \mu {\rm m}$ number counts at flux densities ${\gt }7\, {\rm mJy}$, reducing the Poisson errors compared to existing measurements. The S2LXS XMM-LSS observed number counts show the characteristic upturn at bright fluxes, expected to be motivated by local sources of submillimetre emission and high-redshift strongly lensed galaxies. We find that the observed $850\, \mu {\rm m}$ number counts are best reproduced by model predictions that include either strong lensing or source blending from a 15-arcsec beam, indicating that both may make an important contribution to the observed overabundance of bright single dish $850\, \mu {\rm m}$ selected sources. We make the S2LXS XMM-LSS $850\, \mu {\rm m}$ map and &gt;5σ catalogue presented here publicly available.</jats:p>

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