ar X iv : a st ro - p h / 02 01 18 0 v 1 1 1 Ja n 20 02 The Canada - UK Deep Submillimeter Survey VI : The 3 - Hour Field

We present the complete submillimeter data for the Canada-UK Deep Submillimeter Survey (CUDSS) 3 h field. The observations were taken with the Submillimeter Common-User Bolome-ter Array (SCUBA) on the James Clerk Maxwell Telescope (JCMT) on Mauna Kea. The 3 h field is one of two main fields in our survey and covers 60 square arc-minutes to a 3σ depth of ∼ 3 mJy. In this field we have detected 27 sources above 3σ, and 15 above 3.5σ. We assume the source counts follow the form N (S)∝S −α and measure α = 3.3 +1.4 −1.0. This is in good agreement with previous studies and further supports our claim (Eales et al. 2000) that SCUBA sources brighter than 3 mJy produce ∼20% of the 850µm background energy. Using preliminary ISO 15 µm maps and VLA 1.4 GHz data we have identified counterparts for six objects and have marginal detections at 450µm for two additional sources. With this information we estimate a median redshift for the sample of 2.0±0.5, with ∼10% lying at z < 1. We have measured the angular clustering of S 850µm > 3 mJy sources using the source catalogues from the CUDSS two main fields, the 3 h and 14 h fields, and find a marginal detection of clustering, primarily from the 14 h field, of ω(θ) = 4.4 ± 2.9θ −0.8. This is consistent with clustering at least as strong as that seen for the Lyman-break galaxy population and the Extremely Red Objects. Since SCUBA sources are selected over a broader range in redshifts than these two populations the strength of the true spatial clustering is expected to be correspondingly stronger.