Sub-mm Counterparts to Lyman-break Galaxies

We summarize the main results from our SCUBA survey of Lyman-break galaxies (LBGs) at z ∼ 3. Analysis of our sample of LBGs reveals a mean flux of S850 =0.6±0.2mJy, while simple models of emission based on the UV properties predict a mean flux about twice as large. Known populations of LBGs are expected to contribute flux to the weak sub-mm source portion of the far-IR background, but are not likely to comprise the bright source (S850 > 5mJy) end of the SCUBA-detected source count. The detection of the LBG, Westphal-MM8, at 1.9mJy suggests that deeper observations of individual LBGs in our sample could uncover detections at similar levels, consistent with our UV-based predictions. By the same token, many sub-mm selected sources with S850<2mJy could be LBGs. The data are also consistent with the FarIR/β relation holding at z = 3.