The SCUBA-2 Large eXtragalactic Survey: 850μm map, catalogue and the bright-end number counts of the XMM-LSS field
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
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 Surv e y (S2LXS). S2LXS XMM -LSS maps an area of 9 deg 2 , reaching a moderate depth of 1 σ ≃ 4 mJy beam −1 . This is the largest contiguous area of e xtragalactic sk y mapped by James Clerk Maxwell Telescope (JCMT) at 850 μm to date. The wide area of the S2LXS XMM -LSS surv e y allows us to probe the ultra-bright ( S 850 μm ≳ 15 mJy ), yet rare submillimetre population. We present the S2LXS XMM -LSS catalogue, which comprises 40 sources detected at > 5 σ 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 flux es, e xpected 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 > 5 σ catalogue presented here publicly available.
Date Issued
2023-04-01
Date Acceptance
2023-01-25
Citation
Monthly Notices of the Royal Astronomical Society, 2023, 520 (3), pp.3669-3687
ISSN
0035-8711
Publisher
Oxford University Press
Start Page
3669
End Page
3687
Journal / Book Title
Monthly Notices of the Royal Astronomical Society
Volume
520
Issue
3
Copyright Statement
© The Author(s) 2023. Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
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Subjects
850 MU-M
ACTIVE GALACTIC NUCLEI
ALMA SURVEY
Astronomy & Astrophysics
BOLOMETER CAMERA
catalogues
COSMOLOGY LEGACY SURVEY
DEEP SUBMILLIMETER SURVEY
FAR-INFRARED PROPERTIES
galaxies:high
Physical Sciences
PHYSICAL-PROPERTIES
POINT-SOURCE CATALOG
redshift
Science & Technology
STAR-FORMING GALAXIES
submillimetre:galaxies
surveys
Publication Status
Published
Date Publish Online
2023-01-30