Discovery of a Highly Collimated Molecular Outflow in the Southern BOK Globule BHR 71

Details Discovery of a Highly Collimated Molecular Outflow in the Southern BOK Globule BHR 71 Discovery of a Highly Collimated Molecular Outflow in the Southern BOK Globule BHR 71

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...476..781b&link_type=abstract

Astrophysical Journal v.476, p.781

Astronomy and Astrophysics

Astronomy

68

Ism: Globules, Ism: Individual Alphanumeric: Bhr 71, Ism: Jets And Outflows, Ism: Structure

Scientific paper

We report observations of the southern Bok globule BHR 71 in the J = 1 --> 0 and J = 2 --> 1 lines of 12CO, the J = 1 --> 0 lines of 13CO and C18O, and (J, K) = (1, 1) and (2, 2) inversion lines of NH3 made with angular resolution of ~20" to ~9'. We also report 1.3 mm continuum observations made with SEST with ~20" resolution. The low angular resolution molecular observations indicate that the globule has a diameter of ~0.5 pc, a kinetic temperature of 11 K, a total mass of ~40 M&sun;, and an average molecular density of ~9 x 103 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 ~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 ~84 deg, has a semi-opening angle of 15 deg, and in which the gas moves outward with an approximate constant radial velocity (with respect to the cone apex) of ~28 km s-1. The outflow appears to be driven by a very young stellar object with Lbol ~ 9 L&sun;, whose characteristics at infrared and millimeter wavelengths are similar to those of the so-called Class 0 sources.

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