Star formation associated with high-velocity mass outflows (Invited review)

Details Star formation associated with high-velocity mass outflows (Invited review) Star formation associated with high-velocity mass outflows (Invited review)

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.118..421h&link_type=abstract

(IAU, Asian-Pacific Regional Meeting, 3rd, Kyoto, Japan, Sept. 30-Oct. 5, 1984) Astrophysics and Space Science (ISSN 0004-640X),

Astronomy and Astrophysics

Astrophysics

11

Emission Spectra, Flow Velocity, Orion Nebula, Shock Wave Propagation, Star Formation, Stellar Mass Ejection, Line Spectra, Molecular Gases, Molecular Spectra, Plasma Jets, Protostars, Stellar Structure, Water Masers

Scientific paper

Energetic mass outflows have been detected in molecular line observations towards young stellar objects. Taking the Orion-KL as an example the overall structure of a high-velocity outflow and its environment are discused. The kinematics of the high-velocity molecular emission show clear evidence of a bipolar jet which originates in the vicinity of IRc2, a massive protostar. Towards the ends of the jet, 0.05 pc away from the origin of the flow, the interaction between the high-velocity flow and the ambient molecular gas excites shocks. The protostar is encircled by a disc of dense molecular gas, the inner 0.04 pc of which is expanding, while the outer part shows signs of rotation and conctraction. A comparison between the dynamical timescales of the disk and the bipolar jet may suggest that the disk itself, of some mechanism of disk formation, is also responsible for the bipolar nature of the high-velocity flow.

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