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ALMA BAaDE survey data analysis: detection rates and possible biases

Thursday September 6, 2018
2:00 pm


 Presenter:  Michael Stroh (UNM)
 Series:  Center for Astrophysics Research and Technologies Seminar Series
 Abstract:  In this talk, I will present results from the Atacama Large Millimeter/submillimeter Array (ALMA) portion of the Bulge Asymmetries and Dynamical Evolution (BAaDE) project, a survey that aims to obtain tens of thousands of line-of-sight velocities to late-type stars using SiO maser emission. The results from the first 1,339 sources observed with ALMA are presented. A 71% detection rate of SiO masers is obtained from the sample, which increases to 80% when considering only the likely oxygen-rich stars in our sample. In addition to SiO, emission from carbon lines is also detected in a subset of the sample. Based on Galactic locations, extended emission, and kinematical associations, we are able to classify a significant fraction of our carbon line detections as likely belonging to young stellar objects. Since the primary aim of the BAaDE survey is to use stars as point-mass velocity probes of the Galactic gravitational potential, I will discuss possible biases in our derived line-of-sight velocities, as well as a possible bias between 43 GHz and 86 GHz detected samples. Finally, I will compare the relative SiO line strengths and detection rates and how they agree with current pumping models.
 Host:  Ylva Pihlström
 Location:  Room 190, Physics & Astronomy

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