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A Masing BAaDE’s Window

  • Lorant O. Sjouwerman (a1), Ylva M. Pihlström (a2), Adam C. Trapp (a3), Michael C. Stroh (a2), Luis Henry Quiroga-Nuñez (a4), Megan O. Lewis (a2), R. Michael Rich (a3), Mark R. Morris (a3), Huib Jan van Langevelde (a4), Mark J Claussen (a1) and the BAaDE collaboration...

Abstract

We report on the Bulge Asymmetries and Dynamic Evolution (BAaDE) survey which has observed 19 000 MSX color selected red giant stars for SiO maser emission at 43 GHz with the VLA and is in the process of observing 9 000 of these stars with ALMA at 86 GHz in the Southern sky. Our setup covers the main maser transitions, as well as those of isotopologues and selected lines of carbon-bearing species. Observations of this set of lines allow a far-reaching catalog of line-of-sight velocities in the dust-obscured regions where optical surveys cannot reach. Our preliminary detection rate is close to 70%, predicting a wealth of new information on the distribution of metal rich stars, their kinematics as function of location in the Galaxy, as well as the occurrence of lines and line ratios between the different transitions in combination with the spectral energy distribution from about 1 to 100 μm. Similar to the OH/IR stars, a clear kinematic signature between disk and bulge stars can be seen. Furthermore, the SiO J = →10 (v=3) line plays a prominent role in the derived maser properties.

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References

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A Masing BAaDE’s Window

  • Lorant O. Sjouwerman (a1), Ylva M. Pihlström (a2), Adam C. Trapp (a3), Michael C. Stroh (a2), Luis Henry Quiroga-Nuñez (a4), Megan O. Lewis (a2), R. Michael Rich (a3), Mark R. Morris (a3), Huib Jan van Langevelde (a4), Mark J Claussen (a1) and the BAaDE collaboration...

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