Episodic molecular outflow in the very young protostellar clustern Serpens South

摘要

The loss of mass from protostars, in the form of a jet or outflow, is a necessary counterpart to protostellar mass accretion(1,2). Outflow ejection events probably vary in their velocity and/or in the rate of mass loss. Such 'episodic' ejection events(3) have been observed during the class 0 protostellar phase (the early accretion stage)(4-10), and continue during the subsequent class I phase that marks the first one million years of star formation(11-14). Previously observed episodic-ejection s