Kavli Affiliate: Luis C. Ho
| First 5 Authors: James Pearson, Stephen Serjeant, Wei-Hao Wang, Zhen-Kai Gao, Arif Babul
| Summary:
Bright galaxies at sub-millimetre wavelengths from Herschel are now well
known to be predominantly strongly gravitationally lensed. The same models that
successfully predicted this strongly lensed population also predict about one
percent of faint $450{mu}$m-selected galaxies from deep JCMT surveys will also
be strongly lensed. Follow-up ALMA campaigns have so far found one potential
lens candidate, but without clear compelling evidence e.g. from lensing arcs.
Here we report the discovery of a compelling gravitational lens system
confirming the lensing population predictions, with a $z_{s} = 3.4 {pm} 0.4$
submm source lensed by a $z_{spec} = 0.360$ foreground galaxy within the COSMOS
field, identified through public JWST imaging of a $450{mu}$m source in the
SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES) catalogue. These systems will
typically be well within the detectable range of future wide-field surveys such
as Euclid and Roman, and since sub-millimetre galaxies are predominantly very
red at optical/near-infrared wavelengths, they will tend to appear in
near-infrared channels only. Extrapolating to the Euclid-Wide survey, we
predict tens of thousands of strongly lensed near-infrared galaxies. This will
be transformative for the study of dusty star-forming galaxies at cosmic noon,
but will be a contaminant population in searches for strongly lensed
ultra-high-redshift galaxies in Euclid and Roman.
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