SPATIALLY-RESOLVED SUBMILLIMETER CONTINUUM EMISSION TOWARD L1551-IRS-5

We present high signal-to-noise ratio 16''-20'' resolution submillimeter continuum images of the embedded young stellar object L1551 IRS 5. The images are dominated by a compact source at the position of IRS 5, which has a deconvolved size of 10''+/-3''. Low-level emission extends up to 5000 A.U. from IRS 5 and is distributed nonaxisymetrically. The 1100 mu m emission is extended in the north-south direction and is elliptical in shape. In contrast, our 730 pm map shows emission in a cross-shaped pattern, with arms extending to the north, south, east, and west of IRS 5. The cross emission is not an artifact of our observational methods but rather is intrinsic to the source distribution. We model the submillimeter continuum emission at 1100 pm and 730 pm using three components: an unresolved point source; a cold (similar to 12 K), massive (similar to 1 M.), smoothly distributed envelope; and a warm (greater than or similar to 50 K), less massive (less than or similar to 0.02 M.) ''cross'' centered at the position of IRS 5. We note that the arms of the cross are well aligned with the edges of the CO outflow from IRS 5 and suggest that they may consist of core material warmed and pushed aside by the energetically dominant outflow.