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Astron. Astrophys. 357, L5-L8 (2000)

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Letter to the Editor

First detections of FIRBACK sources with SCUBA

D. Scott  *  1, G. Lagache 2, C. Borys 1, S.C. Chapman 1, M. Halpern 1, A. Sajina 1, P. Ciliegi 3, D.L. Clements 4, H. Dole 2, S. Oliver 5, J.-L. Puget 2, W.T. Reach 6 and M. Rowan-Robinson 5

1 University of British Columbia, Department of Physics & Astronomy, Vancouver, B.C. V6T 1Z1, Canada
2 Université Paris XI, Institut d`Astrophysique Spatiale, Bât. 121, 91405 Orsay Cedex, France
3 Observatories of the Carnegie Institute of Washington, Pasadena, CA 91101, U.S.A.
4 Osservatorio Astronomico di Bologna, Via Ranzani 1, 40127 Bologna, Italy
5 Cardiff University, Department of Physics & Astronomy, P.O. Box 913, Cardiff CF22 3YB, U.K.
6 Astrophysics Group, Imperial College London, Blackett Laboratory, Prince Consort Road, London SW7 2BZ, U.K.
7 Infrared Processing and Analysis Center, California Institute of Technology, Mail Stop 100-22, Pasadena, CA 91125, U.S.A.

Received 29 October 1999 / Accepted 18 March 2000

Abstract

The FIRBACK (Far InfraRed BACKground) survey represents the deepest extensive [FORMULA]m 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[FORMULA]m and for which we had accurate radio positions. Statistically we detect this sample at both 450[FORMULA]m ([FORMULA]) and 850[FORMULA]m ([FORMULA]); individual objects are convincingly detected in four cases at 850[FORMULA]m, and one case at 450[FORMULA]m. Fits to simple spectral energy distributions suggest a range of low to moderate redshifts, perhaps [FORMULA]-1.5 for this FIRBACK sub-sample.

Key words: cosmology: observations – infrared: galaxies – submillimeter – galaxies: evolution

* dscott@astro.ubc.ca

Present address: Observatories of the Carnegie Institute of Washington, Pasadena, CA 91101, U.S.A.

Send offprint requests to: Douglas Scott

Correspondence to: Douglas Scott

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© European Southern Observatory (ESO) 2000

Online publication: May 3, 2000
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