Observations of H2O masers in nearby galaxies

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Astronomical Spectroscopy, Interstellar Masers, Magellanic Clouds, Milky Way Galaxy, Water Masers, H Ii Regions, Hydroxyl Emission, Line Shape, Star Formation

Scientific paper

The authors have searched for 22-GHz H2O maser emission in the Magellanic Clouds and other nearby galaxies. In observations to a limiting luminosity of about 1029.5erg s-1 towards about 80 H II regions of the Large Magellanic Cloud, only four masers were detected. Comparison with H2O observations towards H II regions in our Galaxy suggests that the maser production is considerably lower in the LMC, perhaps indicating a lower rate of star formation. In the search towards the nuclei of nearby southern galaxies only the well-known superluminous masers in NGC 4945 and Circinus galaxy were detected. The mean luminosities were 175 and 29 solar luminosities. Both profiles extend over 150 km s-1 or so and contain narrow components which vary on a time-scale of months. Sometimes several components appear and disappear together, indicating common maser formation in a small-diameter region.

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