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Center for Astrophysics Research and Technologies Seminar Series Information


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The BAaDE project and the relative strengths of 43 GHz and 86 GHz SiO maser lines

Thursday October 5, 2017
2:00 pm

 Presenter:  Michael Stroh (UNM)
 Series:  Center for Astrophysics Research and Technologies Seminar Series
 Abstract:  The Bulge Asymmetries and Dynamical Evolution (BAaDE) project aims to explore the complex structure of the inner Galaxy and Galactic Bulge, by using the 43 GHz receivers at the Very Large Array (VLA) and the 86 GHz receivers at the Atacama Large Millimeter/submillimeter Array (ALMA) to observe SiO maser lines in red giant stars. The goal is to construct a sample of stellar point-mass probes that can be used to test models of the gravitational potential, and the final sample is expected to provide at least 20,000 line-of-sight velocities and positions. The SiO maser transitions occur at radio frequencies, where extinction is negligible, thus allowing a dense sampling of line-of-sight velocities in the most crowded regions of the Milky Way.

While using both the VLA and ALMA ensures a full coverage of the Galactic plane, it also forces one part of the sample to be observed in the 43 GHz J=1–0 SiO transitions, and the other part in the 86 GHz J=2–1 transitions. To assess the robustness of the assumption that the strengths between the 43 GHz and 86 GHz SiO maser emission are on average equal, we used quasi-simultaneous observations of the 43 and 86 GHz SiO lines in nearly 100 BAaDE sources.

In addition to an introduction to the BAaDE project, we present our observational results detailing the relative maser strengths of the 43 GHz and 86 GHz SiO transitions. Since a majority of the primary observing campaign is complete, some of the other results and future work are also discussed.
 Host:  Ylva Pihlström
 Location:  Room 190, Physics & Astronomy

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