Skip to main content Accessibility help

Isotopic SiO Maser Emission from the BAaDE Survey

  • M. J Claussen (a1), M. R. Morris (a2), Y. M. Pihlström (a3), L. O. Sjouwerman (a4) and the BAaDE Team...


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.



Hide All
Cernicharo, J., Bujarrabal, V., & Lucas, R., 1991, A&A, 249, L27
Gonzalez-Alfonso, E. & Cernicharo, J. 1997, A&A, 322, 938
Herpin, F. & Baudry, A. 2000, A&A, 359, 1117
Olofsson, H., Hjalmarson, A., & Rydbeck, O. E. H., 1987, A&A, 100, L30
Soria-Ruiz, R., Alcolea, J., Colomer, F., Bujarrabal, V., & Desmurs, J.-F., 2007, A&A, 468, L1
Soria-Ruiz, R., Colomer, F., Alcolea, J., Bujarrabal, V., Desmurs, J.-F., & Marvel, K. B., 2005, A&A, 432, L39
MathJax is a JavaScript display engine for mathematics. For more information see



Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed