An h2o maser near sagittarius a east: Evidence for active massive star formation near the galactic center

Farhad Yusef-Zadeh, David M. Mehringer

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

We present the results of an H2O maser search of six fields in the inner 5' of the Galactic center using the Very Large Array (VLA) in its DnC configuration. Four new H2O masers are detected with typical luminosities of order 10-7L〇. Three of the masers are associated with evolved stars and one with the Sgr A East H II region, which is identified as the closest active star-forming region to the Galactic center. This H II region and its associated H2O maser lie at the boundary between the shell-type supernova remnant (SNR) source (Sgr A East) and an adjacent +50 km s-1 molecular cloud.Evidence that the pressure wave of the Sgr A East supernova explosion has reached the H II region is given by presenting a radio continuum image of Sgr A East at λ = 20 cm, and it is argued that the expanding SNR is inducing high-mass star formation. The possibility is considered that weak H2O masers, like the 1720 MHz OH masers found at the boundary of the W28 SNR and an adjacent molecular cloud, may also be used as a probe of massive star formation induced by the interaction of an expanding SNR and molecular clouds.

Original languageEnglish (US)
Pages (from-to)L37-L40
JournalAstrophysical Journal
Volume452
Issue number1
DOIs
StatePublished - Oct 10 1995

Keywords

  • Galaxies: ISM
  • Galaxy: Center
  • ISM: Individual (Sagittarius A East)
  • Masers

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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