2000A&A...357L...5S

The FIRBACK (Far InfraRed BACKground) survey represents the deepest extensive 170µm images obtained by the ISO satellite. The sources detected comprise about 10% of the Cosmic IR Background (CIB) seen by COBE, and, importantly, were observed at a wavelength near the peak of the CIB. Detailed follow-up of these sources should help pin down the redshifts, Hubble types, and other properties of the galaxies which constitute this background. We have used the Submillimetre Common-User Bolometer Array (SCUBA) instrument on the James Clerk Maxwell Telescope (JCMT) to search for sub-mm emission from a sample of 10 galaxies which are bright at 170µm and for which we had accurate radio positions. Statistically we detect this sample at both 450µm (∼4σ) and 850µm (∼7σ); individual objects are convincingly detected in four cases at 850µm, and one case at 450µm. Fits to simple spectral energy distributions suggest a range of low to moderate redshifts, perhaps z=0-1.5 for this FIRBACK sub-sample.