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

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

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21812712y&link_type=abstract

American Astronomical Society, AAS Meeting #218, #127.12; Bulletin of the American Astronomical Society, Vol. 43, 2011

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We report the multi-epoch VLBA observations of 22.2GHz water maser emission associated with the "water fountain" star IRAS 18286-0959. The detected maser emission are distributed in the 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 (namely, jet 1) extended from southeast to northwest direction, and the rest of the 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 (mas). The maser features are reasonably fit by a model consisting of two precessing jets. The 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, and for jet 2 it is about 73 years. We propose that the appearance of two jets observed are the result of a single driving source with a significant proper motion. This research was supported by grants from the Research Grants Council of the Hong Kong Special Administrative Region, China, the Seed Funding Programme for Basic Research of the University of Hong Kong, Grant-in-Aid for Young Scientists from the Ministry 9 of Education, Culture, Sports, Science, and Technology, and Grant-in-Aid for Scientific Research from Japan Society for Promotion Science.

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