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We present SCUBA-2 and SMA follow-up observations of four candidate highredshift Dusty Star-Forming Galaxies, selected as sources with rising SEDs inthe 250, 350 and 500$\mu$m Herschel SPIRE bands. Previous SMA observationsshowed no counterparts to these sources, but in our deeper sub-mm observationswe detect counterparts to all four 500$\mu$m risers, with three resolving intomultiple systems. For these three multiple systems, the SMA 345GHz ($\approx870\mu$m) observations recover $123 \pm 73\%$, $60 \pm 15\%$ and $19 \pm 4\%$respectively of the integrated 850$\mu$m flux density from SCUBA-2, indicatingthat there may be additional sources below our SMA detection limit making up adense, protocluster core. The fourth 500$\mu$m riser was observed at a lowerfrequency and so we cannot make a similar comparison. We estimate photometricredshifts based on FIR/sub-mm colours, finding that 3/4 likely lie at $z \geq2$. This fits with the interpretation that the 500$\mu$m riser selectioncriterion selects both intrinsically red, individual galaxies at $z > 4$, andmultiple systems at more moderate redshifts, artificially reddened by theeffects of blending. We use the SCUBA-2 850$\mu$m maps to investigate theenvironments of these 500$\mu$m risers. By constructing cumulative numbercounts and estimating photometric redshifts for surrounding SCUBA-2 detections,we find that one of our 500$\mu$m risers could plausibly reside in a $z \geq 2$protocluster. We infer that bright 500$\mu$m risers with faint 850$\mu$m fluxdensities are typically multiple systems at $z \geq 2$ that may reside inoverdensities of bright sub-mm galaxies.

The Nature of 500 Micron Risers II: Sub-mm Faint Dusty Star Forming Galaxies