OH masers in W 33A |
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| Authors: | Zheng Xing-wu |
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| Institution: | Department of Astronomy, Nanjing University, Nanjing 210008, China |
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| Abstract: | This paper presents observations of OH maser lines of W 33A for the transitions 2Π3/2, J = 3/2, F = 1 → 1 and F = 2 → 2. Two models, a thin tube and a sphere, were used for modelling the masing region and a molecular hydrogen density of about 107 cm?3 was obtained. To give a maser photon emission of the order of 1046 s?1, both models require a pump rate of 1 OH cm?3s?1, while the sphere model requires a higher pump efficiency. |
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| Keywords: | interstellar matter-maser |
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