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Article Dans Une Revue The Astrophysical Journal Année : 2019

An Episodic Wide-angle Outflow in HH 46/47

Résumé

During star formation, the accretion disk drives fast MHD winds, which usually contain two components, a collimated jet and a radially distributed wide-angle wind. These winds entrain the surrounding ambient gas producing molecular outflows. We report a recent observation of 12CO (2–1) emission of the HH 46/47 molecular outflow by the Atacama Large Millimeter/submillimeter Array, in which we identify multiple wide-angle outflowing shell structures in both the blueshifted and redshifted outflow lobes. These shells are highly coherent in position–position–velocity space, extending to gsim40–50 km s−1 in velocity and 104 au in space, with well-defined morphology and kinematics. We suggest these outflowing shells are the result of the entrainment of ambient gas by a series of outbursts from an intermittent wide-angle wind. Episodic outbursts in collimated jets are commonly observed, yet detection of a similar behavior in wide-angle winds has been elusive. Here we show clear evidence that the wide-angle component of the HH 46/47 protostellar outflows experiences variability similar to that seen in the collimated component.
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Dates et versions

hal-02303779 , version 1 (02-10-2019)

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Yichen Zhang, Héctor G Arce, Diego Mardones, Sylvie Cabrit, Michael M Dunham, et al.. An Episodic Wide-angle Outflow in HH 46/47. The Astrophysical Journal, 2019, 883 (1), pp.1. ⟨10.3847/1538-4357/ab3850⟩. ⟨hal-02303779⟩
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