The Canada‐UK Deep Submillimeter Survey. VI. The 3 Hour Field

We present the complete submillimeter data for the Canada-UK DeepSubmillimeter Survey (CUDSS) 3-hour field. The obeservations were taken withthe Submillimeter Common-User Bolometer Array (SCUBA) on the James ClerkMaxwell Telescope on Mauna Kea. The 3-hour field is one of two main fields inour survey and covers 60 square arcminutes to a 3-sigma depth of 3 mJy. In thisfield we have detected 27 sources above 3-sigma and 15 above 3.5-sigma. Weassume the source counts follow the form $N(S) {\propto} S^{-\alpha}$ andmeasure $\alpha$ = 3.3$^{+1.4}_{-1.0}$. This is in good agreement with previousstudies and further supports our claim (Eales et al., 2000) that SCUBA sourcesbrighter than 3 mJy produce ~20% of the 850$\mu$m background energy. Usingpreliminary ISO 15 $\mu$m maps and VLA 1.4 GHz data we have identifiedcounterparts for six objects and have marginal detections at 450$\mu$m for twoadditional sources. With this information we estimate a median redshift for thesample of 2.0$\pm$0.5, with $\sim$10% lying at $z<$ 1. We have measured theangular clustering of S850 > 3 mJy sources using the source catalogues from theCUDSS two main fields, the 3-hour and 14-hour fields, and find a marginaldetection of clustering, primarily from the 14-hour field, of$\omega(\theta)=4.4\pm2.9 \theta^{-0.8}$. This is consistent with clustering atleast as strong as that seen for the Lyman-break galaxy population and theExtremely Red Objects. Since SCUBA sources are selected over a broader range inredshifts than these two populations the strength of the true spatialclustering is expected to be correspondingly stronger.Comment: 17 pages, 8 figures, submitted to Ap