Abstract
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.
Highlights
Strong gravitational lenses are striking astrophysical laboratories that allow us to study the structure and distribution of matter in and around massive galaxies and clusters
In order to better constrain the shape of the far-infrared spectral energy distribution (SED) and determine the redshift of the lensed source, we obtained further sub-millimetre imaging and spectroscopy that we describe in the following
Given the radio flux density and reconstructed radio morphology described above, it is likely that 9io9 contains an active galactic nucleus (AGN) that contributes non-negligibly to the energy output, and Mshould be taken as an upper limit, with the actual star formation rate scaling like γ LIR, where γ ≈ 0.6 for starburst/AGN composite systems at similar epoch with comparable LIR, determined through mid-infrared diagnostics (Coppin et al 2010)
Summary
Strong gravitational lenses are striking astrophysical laboratories that allow us to study the structure and distribution of matter in and around massive galaxies and clusters SPACE WARPS was phenomenally successful: by the end of the final programme on January 9, over 7.5 million classifications of images had been logged, The Red Radio Ring 503. Such that each iJKs-band image in the sample was independently viewed approximately 200 times. Hodge et al (2011) present higher resolution VLA (A and B configuration, θ = 1.8 arcsec) 1.4 GHz imaging of Stripe 82 that partially resolves the radio flux into a ring that follows the Ks-band light (Fig. 2). The flux density scale assumed for 3C 286 incorporated the latest coefficients from Perley & Butler (2013) and a standard model of spatial resolution of the source as observed by eMERLIN.
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