Near-infrared imaging in H2 of molecular (CO) outflows from young stars

Astronomy and Astrophysics – Astrophysics

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Shock Waves, Ism: Jets And Outflows, Ism: Kinematics And Dynamics

Scientific paper

We have imaged several known molecular (CO) outflows in H2 v=1-0 S(1) and wide-band K in order to identify the molecular shocks associated with the acceleration of ambient gas by outflows from young stars. We detected H2 line emission in all the flows we observed: L 1157, VLA 1623, NGC 6334I, NGC 2264G, L 1641N and Haro 4-255. A comparison of the H2 data with CO outflow maps strongly suggests that “prompt entrainment” near the head of a collimated jet probably is the dominant mechanism for producing the CO outflows in these sources.

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