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We present the discovery and a detailed multi-wavelength study of astrongly-lensed luminous infrared galaxy at z=0.816. Unlike most known lensedgalaxies discovered at optical or near-infrared wavelengths this lensed sourceis red, r-Ks = 3.9 [AB], which the data presented here demonstrate is due toongoing dusty star formation. The overall lensing magnification (a factor of17) facilitates observations from the blue optical through to 500micron, fullycapturing both the stellar photospheric emission as well as the re-processedthermal dust emission. We also present optical and near-IR spectroscopy. Theseextensive data show that this lensed galaxy is in many ways typical ofIR-detected sources at z~1, with both a total luminosity and size in accordancewith other (albeit much less detailed) measurements in samples of galaxiesobserved in deep fields with the Spitzer telescope. Its far-infrared spectralenergy distribution is well-fit by local templates that are an order ofmagnitude less luminous than the lensed galaxy; local templates of comparableluminosity are too hot to fit. Its size (D~7kpc) is much larger than localluminous infrared galaxies, but in line with sizes observed for such galaxiesat z~1. The star formation appears uniform across this spatial scale. In thissource, the luminosity of which is typical of sources that dominate the cosmicinfrared background, we find that star formation is spatially extended and wellorganised, quite unlike the compact merger-driven starbursts which are typicalfor sources of this luminosity at z~0.

SGAS 143845.1+145407: A Big, Cool Starburst at Redshift 0.816