SWAG water masers in the galactic center

Jürgen Ott, Nico Krieger, Matthew Rickert, David Meier, Adam Ginsburg, Farhad Yusef-Zadeh

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


The Galactic Center contains large amounts of molecular and ionized gas as well as a plethora of energetic objects. Water masers are an extinction-insensitive probe for star formation and thus ideal for studies of star formation stages in this highly obscured region. With the Australia Telescope Compact Array, we observed 22 GHz water masers in the entire Central Molecular Zone with sub-parsec resolution as part of the large SWAG survey: Survey of Water and Ammonia in the Galactic Center. We detect of order 600 22 GHz masers with isotropic luminosities down to ~10-7 L⊙. Masers with luminosities of ≳10-6 L⊙ are likely associated with young stellar objects. They appear to be close to molecular gas streamers and may be due to star formation events that are triggered at pericenter passages near Sgr A∗. Weaker masers are more widely distributed and frequently show double line features, a tell-tale sign for an origin in evolved star envelopes.

Original languageEnglish (US)
Pages (from-to)172-175
Number of pages4
JournalProceedings of the International Astronomical Union
Issue numberS336
StatePublished - 2017


  • Galaxy: center
  • masers
  • radio lines: stars

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science


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