Compact Ouflows Associated with TMC‐1 and TMC‐1A
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Abstract
High spatial resolution observations are presented of the compact outflows associated with the young protostars TMC-1 (IRAS 04381+2540) and TMC-1A (IRAS 04365+2535) in Taurus. Emission in CO(1–0) imaged with the Owens Valley Millimeter Array shows the outflow lobes to be conical close to the star. Analysis of the outflow dynamics indicates that these objects are low-luminosity versions of the energetic outflows more commonly observed. Near-infrared images at H and K bands show a close correspondence between reflection nebulosity and the location of high-velocity gas and suggest the outflow cavity is evacuated, as do position-velocity diagrams of the CO(2-1). Comparison of the J = 1–0 transition with emission in the 2–1 line indicates that the excitation temperature in the high-velocity gas is higher than the surrounding Taurus cloud. We place limits on the inclination of both objects by comparing the data with theoretical outflow models and conclude that i ~ 40°–70° for both objects. The depro-jected opening angles of the outflow cones are then in the range 30°–40°.
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