Accurate interferometer positions of H2O masers

Details Accurate interferometer positions of H2O masers Accurate interferometer positions of H2O masers

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...221..137f&link_type=abstract

Astrophysical Journal, Part 1, vol. 221, Apr. 1, 1978, p. 137-144.

Astronomy and Astrophysics

Astrophysics

81

Infrared Spectra, Interferometry, Interstellar Masers, Water Masers, H Ii Regions, Hydrogen Ions, Positioning, Stellar Evolution, Water Vapor

Scientific paper

Accurate interferometer positions are reported for strong water-vapor masers in the regions ON 1, W51, VY CMa, Sgr B2, W75, and NGC 7538. The absolute position uncertainties are mostly less than about 0.5 arcsec. Among the 13 H2O maser sources or groups of spots for which accurate interferometer positions are available, no infrared point sources are coincident in eight cases, OH masers may be coincident in six cases, and H2O masers lie at the edge of compact H II regions in five cases. In four out of the latter five cases, no infrared emission is seen toward the compact H II regions. Thus the maser emission does not arise in a dense shell of dust, a cocoon that completely surrounds the O star and its compact H II region, because such a shell would have a large infrared luminosity. It appears, rather, that the maser emission arises in separate fragments or condensations.

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