An H 2O Maser near Sagittarius A East: Evidence for Active Massive Star Formation near the Galactic Center

Details An H 2O Maser near Sagittarius A East: Evidence for Active Massive Star Formation near the Galactic Center An H 2O Maser near Sagittarius A East: Evidence for Active Massive Star Formation near the Galactic Center

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...452l..37y&link_type=abstract

Astrophysical Journal Letters v.452, p.L37

Astronomy and Astrophysics

Astronomy

15

Galaxies: Ism, Galaxy: Center, Ism: Individual Name: Sagittarius A East, Masers

Scientific paper

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) 1 in its DnC configuration. Four new H2O masers are detected with typical luminosities of order 10-7 L&sun;. 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 lambda = 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.

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