First Constraints on Source Counts at 350 μm

Khan, S.; Schafer, R.A.; Serjeant, S.; Willner, S.P.; Pearson, C.P.; Benford, D.J.; Staguhn, J.G.; Moseley, S.H.; Sumner, T.J.; Asmby, M.L.N.; Borys, C.K.; Chanial, P.; Clements, D.L.; Dowell, C.D.; Dwek, E.; Fazio, G.G.; Kovaks, A.; Le Floc'h, E. and Silverberg, R.F. (2007). First Constraints on Source Counts at 350 μm. Astrophysical Journal, 665 pp. 973–979.




We have imaged a 6 arcmin2 region in the Boötes Deep Field using the 350 m–optimized second-generation Submillimeter High Angular Resolution Camera (SHARC II), achieving a peak 1 sensitivity of 5 mJy. We detect three sources above 3 , and determine a spurious source detection rate of 1.09 in our maps. In the absence of 5 detections, we rely on deep 24 m and 20 cm imaging to deduce which sources are most likely to be genuine, giving two real sources. From this we derive an integral source count of 0.84 sources arcmin-2 at S > 13 mJy, which is consistent with 350 m source count models that have an IR-luminous galaxy population evolving with redshift. We use these constraints to consider the future for ground-based short-submillimeter surveys.

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