First detections of FIRBACK sources with SCUBA
Clements, D. L.; Dole, H.; Lagache, G.; Puget, J. -L.; Reach, W. T.; Scott, D.; Halpern, M.; Rowan-Robinson, M.; Chapman, S. C.; Borys, C.; Oliver, S.; Sajina, A.; Ciliegi, P.
Canada, France, United States, Italy, United Kingdom
Abstract
The FIRBACK (Far InfraRed BACKground) survey represents the deepest extensive 170 μm 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 170 μm and for which we had accurate radio positions. Statistically we detect this sample at both 450 μm (~ 4sigma ) and 850 μm (~ 7sigma ); individual objects are convincingly detected in four cases at 850 μm, and one case at 450 μm. Fits to simple spectral energy distributions suggest a range of low to moderate redshifts, perhaps z = 0-1.5 for this FIRBACK sub-sample.