CO outflows from YSO

Astronomy and Astrophysics – Astronomy

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Scientific paper

We have mapped the CO J=1-0 emission from molecular outflows associated with six young stellar systems using the BIMA array. The systems, L 723, IRAM 04191, L 1641S, HH 114/115, L 1221 and RNO 91, are all relatively nearby, low luminosity and range from Class 0 to Class II sources. L 723 and L 1221 are found to be pairs of bipolar outflows. Generally, the CO outflow forms a shell structure around the outflow axis with the higher velocity emission further out from the source. For some outflows, e.g., L 723 and RNO 91, although there are no H2 bow shock structures detected along the outflow axis, there are clumpy and bow-like structures in CO along the outflow axis within the shell. Comparing the observed outflow features to that of the jet- and wind-driven models, we find that the outflow systems show some features that are characteristic of the jet-driven model and some features that are characteristic of the wind-driven model. However, neither model can fully explain the kinematic features of these outflows. In addition, the jet-driven model may need jet wandering to produce the observed outflow width and momentum for most of these outflows, while the wind-driven model may need a collimated core with strong velocity gradient away from the core to produce the highly collimated outflows and the observed curved internal H2 bow shock structures.

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