The SCUBA-2 Large eXtragalactic Survey: 850μm map, catalogue and the bright-end number counts of the XMM-LSS field
Monthly Notices of the Royal Astronomical Society(2022)
摘要
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 >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 >5σ catalogue presented here publicly available.
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关键词
catalogues,surveys,galaxies: high-redshift,submillimetre: galaxies
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