Discovery of a highly collimated molecular outflow in the southern Bok globule BHR 71

We report observations of the southern Bok globule BHR 71 in the J = 1 --> 0 and J = 2 --> 1 lines of (CO)-C-12, the J = 1 --> 0 lines of (CO)-C-13 and (CO)-O-18, and (J, K) = (1, 1) and (2, 2) inversion lines of NH3 made with angular resolution of similar to 20 '' to similar to 9'. We also report 1.3 mm continuum observations made with SEST with similar to 20 '' resolution. The low angular resolution molecular observations indicate that the globule has a diameter of similar to 0.5 pc, a kinetic temperature of 11 K, a total mass of similar to 40 M., and an average molecular density of similar to 9 x 10(3) cm(-3). The high angular resolution observations reveal the presence, near the center of the globule, of a highly collimated bipolar outflow with lobes extending by similar to 0.3 pc in opposite directions from a strong 1.3 mm continuum source. The morphology and velocity structure of the flow is found to be well described by a biconical outflow that is inclined from the line of sight at an angle of similar to 84 degrees, has a semi-opening angle of 15 degrees, and in which the gas moves outward with an approximate constant radial velocity (with respect to the cone apex) of similar to 28 km s(-1). The outflow appears to be driven by a very young stellar object with L(bol) similar to 9 L., whose characteristics at infrared and millimeter wavelengths are similar to those of the so-called Class O sources.