Center for Astrophysics Research and Technologies Seminar Series
ALMA BAaDE survey data analysis: detection rates and possible biases
Presented by Michael Stroh (UNM)
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.
2:00 pm, Thursday, September 6, 2018
PAIS-2540, PAIS
Individuals with disabilities who need an auxiliary aid or service to attend or participate in P&A events should contact the Physics Department (phone: 505-277-2616, email: physics@unm.edu) well in advance to ensure your needs are accomodated. Event handouts can be provided in alternative accessible formats upon request. Please contact the Physics front office if you need written information in an alternative format.
A schedule of talks within the Department of Physics and Astronomy is available on the P&A web site at http://physics.unm.edu/pandaweb/events/index.php