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Variations of the H2O maser emission of W51M in 1981–1998
Authors:V A Samodurov  S V Logvinenko
Institution:(1) Pushchino Radio Astronomy Observatory, Astro Space Center, Lebedev Institute of Physics, Pushchino, Moscow oblast, 142292, Russia
Abstract:The results of spectral monitoring of the maser source W51M carried out in the water-vapor line at 1.35 cm (22GHz) on the 22-m telescope of the Pushchino Radio Astronomy Observatory in 1981–1998 are reported and interpreted. Long-term variations of the maser flux with a period of 12–13 years are found. W51M may be a rotating and simultaneously expanding toroidal cloud of gas and dust around a young star with a mass of the order of ~15M , with numerous high-velocity jets of maser condensations flowing out in two broad cones along the polar axis of the torus. A stellar wind with a velocity of about 2000–3000 km/s is responsible for the maser pumping.
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