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Isotopic SiO Maser Emission from the BAaDE Survey

Published online by Cambridge University Press:  16 July 2018

M. J Claussen ,
M. R. Morris ,
Y. M. Pihlström ,
L. O. Sjouwerman  and
the BAaDE Team
M. J Claussen
Affiliation:
National Radio Astronomy Observatory P.O Box O, Socorro, NM 87801USA email: mclausse@nrao.edu
M. R. Morris
Affiliation:
Div. of Astronomy & Astrophysics, UCLA, Los Angeles CA 90095USA email: morris@astro.ucla.edu
Y. M. Pihlström
Affiliation:
Dept. of Physics & Astronomy, Univ. New Mexico, Albuquerque, NM 87131USA email: ylva@unm.edu
L. O. Sjouwerman
Affiliation:
National Radio Astronomy Observatory P.O. Box O, Socorro, NM 87801USA email: lsjouwer@nrao.edu
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Abstract

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The Bulge Asymmetries and Dynamical Evolution (BAaDE) project aims to map the positions and velocities of up to ~20,000 late-type stars with SiO maser emission along the full Galactic plane, with a large concentration in the Galactic Bulge and inner Galaxy. Both J = 1 → 0 and J = 2 → 1 transitions using the Very Large Array (VLA) and the Atacama Large Millimeter Array (ALMA) are being observed. In the VLA observing setup, in addition to the 28SiO, v = 1 and v = 2J = 1 → 0 maser transitions, the bandwidth was wide enough to include the J = 1 → 0 transitions of the rare isotopologues of the SiO molecule in both the ground and vibrationally excited states: 29SiO, v = 0, 30SiO, v = 0, 29SiO, v = 1, and 29SiO, v = 2. Approximately 10% of the initial ~3500 targets of the project show maser emission from at least one of these lines. Some of these stars (with isotopic maser emission) show high radial velocities which implies that they are indeed in the Galactic Bulge or inner Galaxy (i.e. not foreground objects). We present line profiles, refined detection statistics, and the implications of the detection of the isotopic maser emission on pumping schemes that have been previously presented.

Keywords

masersstars: AGB and post-AGBsurvey
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. 49 - 52
Copyright
Copyright © International Astronomical Union 2018 

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