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Submillimeter H2O maser emission from water fountain nebulae

Published online by Cambridge University Press:  16 July 2018

Daniel Tafoya ,
Wouter H. T. Vlemmings  and
Andres F. Pérez-Sánchez
Daniel Tafoya
Affiliation:
Chalmers University of Technology, Onsala Space Observatory, 439 92 Onsala, Sweden email: daniel.tafoya@chalmers.se
Wouter H. T. Vlemmings
Affiliation:
Chalmers University of Technology, Onsala Space Observatory, 439 92 Onsala, Sweden email: daniel.tafoya@chalmers.se
Andres F. Pérez-Sánchez
Affiliation:
European Southern Observatory, Alonso de Córdova 3107, Vitacura, Casilla 19001, Santiago, Chile
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Abstract

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We present the results of the first detection of submillimeter water maser emission toward water-fountain nebulae. Using APEX we found emission at 321.226 GHz toward two sources: IRAS 18043−2116, and IRAS 18286−0959. The submillimeter H2O masers exhibit expansion velocities larger than those of the OH masers, suggesting that these masers, similarly to the 22 GHz masers, originate in fast bipolar outflows. The 321 GHz masers in IRAS 18043−2116 and IRAS 18286−0959, which figure among the sources with the fastest H2O masers, span a velocity range similar to that of the 22 GHz masers, indicating that they probably coexist. The intensity of the submillimeter masers is comparable to the 22 GHz masers, implying that the kinetic temperature of the region where the masers originate is Tk>1000 K. We propose a simple model invoking the passage of two shocks through the same gas that creates the conditions for explaining the strong high-velocity 321 GHz masers coexisting with the 22 GHz masers in the same region.

Keywords

submillimeterISM: jets and outflowsstars: AGB and post-AGBmasers
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S336: Astrophysical Masers: Unlocking the Mysteries of the Universe , September 2017 , pp. 369 - 372
Copyright
Copyright © International Astronomical Union 2018 

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