The Red Radio Ring: a gravitationally lensed hyperluminous infrared
  radio galaxy at z=2.553 discovered through citizen science
  We report the discovery of a gravitationally lensed hyperluminous infrared
galaxy (L_IR~10^13 L_sun) with strong radio emission (L_1.4GHz~10^25 W/Hz) at
z=2.553. The source was identified in the citizen science project SpaceWarps
through the visual inspection of tens of thousands of iJKs colour composite
images of Luminous Red Galaxies (LRGs), groups and clusters of galaxies and
quasars. Appearing as a partial Einstein ring (r_e~3") around an LRG at z=0.2,
the galaxy is extremely bright in the sub-millimetre for a cosmological source,
with the thermal dust emission approaching 1 Jy at peak. The redshift of the
lensed galaxy is determined through the detection of the CO(3-2) molecular
emission line with the Large Millimetre Telescope's Redshift Search Receiver
and through [OIII] and H-alpha line detections in the near-infrared from
Subaru/IRCS. We have resolved the radio emission with high resolution (300-400
mas) eMERLIN L-band and JVLA C-band imaging. These observations are used in
combination with the near-infrared imaging to construct a lens model, which
indicates a lensing magnification of ~10x. The source reconstruction appears to
support a radio morphology comprised of a compact (<250 pc) core and more
extended component, perhaps indicative of an active nucleus and jet or lobe.
