An Episodic Wide-angle Outflow in HH 46/47

Abstract

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 recent observation of 12CO (2-1) emission of the HH 46/47 molecular outflow by the Atacama Large Millimeter/sub-millimeter Array, in which we identify multiple wide-angle outflowing shell structures in both the blue and red-shifted outflow lobes. These shells are highly coherent in position-position-velocity space, extending to >40-50 km/s in velocity and 10^4 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 similar variability seen in the collimated component.

arXiv comment13 pages, 5 figures, accepted to ApJ

References in corpus (39)

• The Evolution of Outflow-Envelope Interactions in Low-Mass Protostars
• HST/STIS spectroscopy of the optical outflow from DG Tau: structure and kinematics on sub-arcsecond scales
• Variable protostellar accretion with episodic bursts
• Resolving the Luminosity Problem in Low-Mass Star Formation
• Magneto-thermal Disk Wind from Protoplanetary Disks
• Resolved images of a protostellar outflow launched by an extended disk wind
• The COMPLETE Survey of Outflows in Perseus
• Long-term Evolution of Protostellar and Protoplanetary Disks. I. Outbursts
• A molecular survey of outflow gas: velocity-dependent shock chemistry and the peculiar composition of the EHV gas
• Disk-Driven Rotating Bipolar Outflow in Orion Source I
• Evolution of Protostellar Outflow around Low-mass Protostar
• Molecular Outflows Driven by Low-Mass Protostars. I. Correcting for Underestimates When Measuring Outflow Masses and Dynamical Properties
• Recipes for stellar jets: results of combined optical/infrared diagnostics
• ALMA discovery of a rotating SO/SO${}_2$ flow in HH212. A possible MHD disk wind?
• The HH30 edge-on T Tauri star A rotating and precessing monopolar outflow scrutinized by ALMA
• CARMA observations of protostellar outflows in NGC 1333
• The Turbulent Origin of Outflow and Spin Misalignment in Multiple Star Systems
• Episodic molecular outflow in the very young protostellar cluster Serpens South
• Impact of Protostellar Outflows on Turbulence and Star Formation Efficiency in Magnetized Dense Cores
• ALMA Observations of the HH 46/47 Molecular Outflow
• Investigations of Protostellar Outflow Launching and Gas Entrainment: Hydrodynamic Simulations and Molecular Emission
• Submillimeter arcsecond-resolution mapping of the highly collimated protostellar jet HH 211
• APEX-CHAMP+ high-J CO observations of low-mass young stellar objects: I. The HH 46 envelope and outflow
• Accretion and ejection properties of embedded protostars: the case of HH26, HH34 and HH46 IRS
• Outflows, infall and evolution of a sample of embedded low-mass protostars. The William Herschel Line Legacy (WILL) survey
• Highly Collimated Jets and Wide-Angle Outflows in HH46/47: New Evidence from Spitzer IR Images
• Jet Motion, Internal Working Surfaces, and Nested Shells in the Protostellar System HH 212
• [OI]63micron jets in class 0 sources detected by Herschel
• HiRes Deconvolved Spitzer Images of 89 Protostellar Jets and Outflows: New Data on Evolution of Outflow Morphology
• Proper Motions of the HH 47 Jet Observed with the Hubble Space Telescope
• Rotation in the NGC 1333 IRAS 4C Outflow
• Herschel/PACS observations of young sources in Taurus: the far-infrared counterpart of optical jets
• ALMA Cycle 1 Observations of the HH46/47 Molecular Outflow: Structure, Entrainment and Core Impact
• IR diagnostics of embedded jets: kinematics and physical characteristics of the HH46-47 jet
• Synthetic Observations of Magnetic Fields in Protostellar Cores
• Collimation of a Central Wind by a Disk-Associated Magnetic Field
• Proper Motions and Variability of the H${}_2$ Emission in the HH~46/47system
• Anatomy of the internal bow shocks in the IRAS 04166+2706 protostellar jet
• Widening of Protostellar Outflows: an Infrared Outflow Survey in Low Luminosity Objects

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