LUMINOUS RADIO-QUIET SOURCES IN W3(MAIN)

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