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Thousands of Stellar SiO masers in the Galactic center: The Bulge Asymmetries and Dynamic Evolution (BAaDE) survey

  • Loránt O. Sjouwerman (a1), Ylva M. Pihlström (a1) (a2), R. Michael Rich (a3), Mark R. Morris (a3) and Mark J Claussen (a1)...

Abstract

A radio survey of red giant SiO sources in the inner Galaxy and bulge is not hindered by extinction. Accurate stellar velocities (<1 km/s) are obtained with minimal observing time (<1 min) per source. Detecting over 20,000 SiO maser sources yields data comparable to optical surveys with the additional strength of a much more thorough coverage of the highly obscured inner Galaxy. Modeling of such a large sample would reveal dynamical structures and minority populations; the velocity structure can be compared to kinematic structures seen in molecular gas, complex orbit structure in the bar, or stellar streams resulting from recently infallen systems. Our Bulge Asymmetries and Dynamic Evolution (BAaDE) survey yields bright SiO masers suitable for follow-up Galactic orbit and parallax determination using VLBI.

Here we outline our early VLA observations at 43 GHz in the northern bulge and Galactic plane (0<l°<250), and ALMA observations at 86 GHz in the southern bulge (250<l°<360). We report a preliminary overall 70% detection rate in our color-selected MSX sources.

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References

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Habing, , 1996, A&ARev., 7, 97
Olnon, , et al. 1984, ApJ (Letters), 278, L41
Sjouwerman, , et al. 2009, ApJ, 705, 1554
Vauterin, , & Dejonghe, 1998, ApJ, 500, 233
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