VLA Observations of OH Masers and Associated Ultracompact Continuum Sources
We have observed 22 OH masers and associated continuum sources with the VLA at λ 18 cm, and deduce that type I masers are always associated with ultracompact continuum sources, while type II(a) (1720 MHz) masers probably never are. Implications for the type of pumping for each category of maser are discussed.
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