The SCUBA-2 Large eXtragalactic Survey: 850 μm map, catalogue and the bright-end number counts of the XMM-LSS field
Journal article, 2023
We present 850 μm 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 deg2, reaching a moderate depth of 1σ 4 mJy beam−1. This is the largest contiguous area of extragalactic sky mapped by James Clerk Maxwell Telescope (JCMT) at 850 μm to date. The wide area of the S2LXS XMM-LSS survey allows us to probe the ultra-bright (S850μm 15 mJy), yet rare submillimetre population. We present the S2LXS XMM-LSS catalogue, which comprises 40 sources detected at >5σ significance, with deboosted flux densities in the range of 7–48 mJy. We robustly measure the bright-end of the 850 μm number counts at flux densities >7 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 μm 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 μm selected sources. We make the S2LXS XMM-LSS 850 μm map and >5σ catalogue presented here publicly available.
catalogues
galaxies: high-redshift
surveys
submillimetre: galaxies
Author
T. K. Garratt
University of Hertfordshire
J.E. Geach
University of Hertfordshire
Y. Tamura
Nagoya University
K. E. K. Coppin
University of Hertfordshire
Y. Ao
University of Science and Technology of China
Chinese Academy of Sciences
Chung-Chen Chen
Academia Sinica
C. Cheng
Chinese Academy of Sciences
D. L. Clements
Imperial College London
Y. Sophia Dai
Chinese Academy of Sciences
H. Dannerbauer
University of La Laguna
Instituto de Astrofísica de Canarias
T. R. Greve
Technical University of Denmark (DTU)
University College London (UCL)
B. Hatsukade
University of Tokyo
H. S. Hwang
Seoul National University
L. Jiang
Beijing University of Technology
K. Kohno
University of Tokyo
M. P. Koprowski
Nicolaus Copernicus University
M. J. Michałowski
Adam Mickiewicz University in Poznań
M. Sawicki
Saint Mary's University
D. Scott
University of British Columbia (UBC)
H. Shim
Kyungpook National University
T. T. Takeuchi
The Institute of Statistical Mathematics
Nagoya University
W. H. Wang
Academia Sinica
Y. Q. Xue
University of Science and Technology of China
Chentao Yang
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 520 3 3669-3687Subject Categories
Astronomy, Astrophysics and Cosmology
DOI
10.1093/mnras/stad307