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.
KeywordsContinuum Source Ambipolar Diffusion Rotational Excitation Collisional Excitation National Radio Astronomy Observatory
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