Proc. IAU volume 13, issue S336, P351-354 2017 DOI: 10.1017/s1743921317009589 View full text
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Gabor Orosz, José F. Gómez, Daniel Tafoya, Hiroshi Imai, José M. Torrelles, Ann Njeri Ngendo, Ross A. Burns

Abstract: We briefly introduce the VLBI maser astrometric analysis of IRAS 18043-2116 and IRAS 18113-2503, two remarkable and unusual water fountains with spectacular bipolar bow shocks in their high-speed collimated jet-driven outflows. The 22 GHz H2O maser structures and velocities clearly show that the jets are formed in very short-lived, episodic outbursts, which may indicate episodic accretion in an underlying binary system.