LUMINOUS RADIO-QUIET SOURCES IN W3(MAIN)

We have resolved the 450-800 mum emission from the W3(Main) star formi ng region into three major peaks, using an 8'' beam on the James Clerk Maxwell Telescope (JCMT). One of the submillimeter sources is identif ied with W3-IRS 5, a well-known candidate protostar. However, to our s urprise, we find that none of the submillimeter peaks coincides with a ny of the prominent compact H II regions in the area. We estimate that the three submillimeter sources together contribute 35%-50% of the to tal bolometric luminosity of the region and speculate that the contrib ution of luminous radio-quiet sources to the total luminosity of H II region/molecular cloud complexes may be larger than is often assumed.