We thank the staff at the JACH for their support, and Drs. D. H. Hughes and G. Knapp for helpful comments on an earlier version of this paper. The James Clerk Maxwell Telescope is operated by the Royal Observatories on behalf of the Particle Physics and Astronomy Research Council of the United Kingdom, the Netherlands Organization for Scientific Research, and the National Research Council of Canada. Data reductions were carried out using Starlink computing resources.
© European Southern Observatory (ESO) 1997
Online publication: July 8, 1998