High Velocity Precessing Jets from the Water Fountain IRAS 18286-0959 Revealed by VLBA Observations

Details High Velocity Precessing Jets from the Water Fountain IRAS 18286-0959 Revealed by VLBA Observations High Velocity Precessing Jets from the Water Fountain IRAS 18286-0959 Revealed by VLBA Observations

2011-08-10

arxiv.org/abs/1108.2104v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

84 pages, 16 figures, accepted for publication in ApJ

Scientific paper

We report the results of multi-epoch VLBA observations of the 22.2GHz water maser emission associated with the "water fountain" IRAS 18286-0959. We suggest that this object is the second example of a highly collimated bipolar precessing outflow traced by water maser emission, the other is W43A. The detected water emission peaks are distributed over a velocity range from -50km/s to 150km/s. The spatial distribution of over 70% of the identified maser features is found to be highly collimated along a spiral jet (jet 1) extended southeast to northwest, the remaining features appear to trace another spiral jet (jet 2) with a different orientation. The two jets form a "double-helix" pattern which lies across ~200 milliarcseconds. The maser distribution is reasonably fit by a model consisting of two bipolar precessing jets. The 3D velocities of jet 1 and jet 2 are derived to be 138km/s and 99km/s, respectively. The precession period of jet 1 is about 56 years. For jet 2, three possible models are tested and they give different values for the kinematic parameters. We propose that the appearance of two jets is the result of a single driving source with significant proper motion.

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