Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.254..525r&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 254, Feb. 1, 1992, p. 525-538.
Astronomy and Astrophysics
Astronomy
98
Carbon Monoxide, Gas Jets, Interstellar Gas, Molecular Clouds, H Ii Regions, Orion Constellation, Seeing (Astronomy)
Scientific paper
Twelve-arcsec resolution CO observations of the fast unipolar molecular jet in Orion B together with maps of the ambient cloud as traced by CS and C(O-18) emission are reported. The flow (which appears to originate from FIR5) consists of many clumps of gas, with sizes less than approximately 10 exp 15 m and velocity dispersions about 6 km/s, which fill an almost cylindrical lobe; these clumps are probably formed locally through hydrodynamic instabilities rather than being bullets of protostellar ejecta. The flow is centrally condensed and, at the highest projected velocities (about 45 km/s), an unresolved jet of material is detected with an opening angle about 2 deg. The lower velocity outflowing gas forms a sheath around this jet. This narrow CO feature is as highly collimated as the optical jets seen in other systems, and its termination has been detected in the H2 V = 1-0 S(1) line. The system is thus very similar to many optical jet/HH objects seen in less obscured star-forming regions, and it is suggested that the fast highly collimated CO is being entrained in the neutral high Mach number jet which is driving the molecular outflow.
Hills Richard E.
Padman Rachael
Richer John S.
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