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.
@article{arxiv.1804.02672,
title = {Bow shocks in water fountain jets},
author = {Gabor Orosz and José F. Gómez and Daniel Tafoya and Hiroshi Imai and José M. Torrelles and Ann Njeri Ngendo and Ross A. Burns},
journal= {arXiv preprint arXiv:1804.02672},
year = {2018}
}
Comments
To appear in the proceedings of the IAU Symposium 336: Astrophysical Masers: Unlocking the Mysteries of the Universe (4-8 September 2017, Cagliari, Italy) - IAU Proceedings Series, eds. A. Tarchi, M. J. Reid, and P. Castangia