Strong Water Maser

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Scientific paper

F. Haynes, R. S. Roger, J. R. Forster, B. J. Robinson, R. A. Batchelor and K. J. Wellington, Division of Radiophysics, CSIRO, Sydney, report: "We have discovered a very strong H2O maser at R.A. = 13h13m28s6, Decl. = -62deg42'54"5 (equinox 1950.0: 1-sigma error +/- 15" ). The peak intensity measured on Apr. 30 was in excess of 3000 Jy as measured in the feature centered at an LSR velocity of -26 km/s. Other features are observed at -32.5, -37 and -51 km/s. Inspection of the southern hemisphere 5-GHz survey (Haynes, Caswell and Simons 1978, Aust. J. Phys. Suppl. No. 45) shows no strong, compact H II region in the immediate neighborhood of the H2O source, nor any old maser. Recombination-line measurements in the nearby G305.4 complex of H II regions (Caswell and Haynes, private communication) show characteristic LSR velocities of -30 to -40 km/s. Inspection of southern-hemisphere plates shows that no bright infrared star is present at the position of the H2O maser, although some obscuration is clearly present. The authors request that observations be made in the infrared and at OH and H2CO recombination-line frequencies at an early date, while the H2O maser remains strong."

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