SWAG: Distribution and Kinematics of an Obscured AGB Population toward the Galactic Center

Jürgen Ott, David S. Meier, Adam Ginsburg, Farhad Yusef-Zadeh, Nico Krieger, Cornelia Jäschke

Research output: Contribution to journalArticlepeer-review


Outflows from AGB stars enrich the Galactic environment with metals and inject mechanical energy into the ISM. Radio spectroscopy can recover both properties through observations of molecular lines. We present results from SWAG: Survey of Water and Ammonia in the Galactic Center. The survey covers the entire Central Molecular Zone (CMZ), the inner 3.35° × 0.9° (∼480 × 130 pc) of the Milky Way that contains 5 × 107 M· of molecular gas. Although our survey primarily targets the CMZ, we observe across the entire sightline through the Milky Way. AGB stars are revealed by their signature of double peaked 22 GHz water maser lines. They are distinguished by their spectral signatures and their luminosities, which reach up to 10-7 L·. Higher luminosities are usually associated with Young Stellar Objects located in CMZ star forming regions. We detect a population of ∼600 new water masers that can likely be associated with AGB outflows.

Original languageEnglish (US)
Pages (from-to)485-486
Number of pages2
JournalProceedings of the International Astronomical Union
StatePublished - Aug 2 2018


  • Galaxy: center
  • ISM: molecules
  • radio lines: stars
  • stars: AGB and post-AGB

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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