Abstract
OH maser sources of type I, which are related to regions of star formation, have been known for more than a decade. However, despite great effort no satisfactory theoretical interpretation has yet been given. (For general reviews on cosmic masers see refs 1–5.) A model for the interpretation of type I OH maser sources is suggested here. This model combines the effect of velocity and magnetic field gradients with radiative pumping by means of the (2∏3/2, J= 5/2 →2∏1/2, J = 5/2) transition. Due to an overlap of particular hyperfine components, inversion of the 1,665 MHz line is favoured.
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Kegel, W., Varshalovich, D. Interpretation of type I OH maser sources. Nature 286, 136–138 (1980). https://doi.org/10.1038/286136a0
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DOI: https://doi.org/10.1038/286136a0
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