Further detections of H2O-emission from external galaxies

Details Further detections of H2O-emission from external galaxies Further detections of H2O-emission from external galaxies

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....64l..21h&link_type=abstract

Astronomy and Astrophysics, vol. 64, no. 1-2, Mar. 1978, p. L21-L24. Deutsche Forschungsgemeinschaft

Astronomy and Astrophysics

Astronomy

39

Extragalactic Radio Sources, Interstellar Masers, Radio Astronomy, Water Masers, H Ii Regions, Line Spectra, Luminosity, Radial Velocity

Scientific paper

This letter reports on a search for 22-GHz water-vapor maser emission from H II regions in the Sc galaxies M33 and IC 342. The 6(16)-5(23) transition of H2O at 22.235 GHz was detected in three H II regions in M33 as well as in two H II regions in IC 342. It is found that the line profiles are narrow, as is typical for H2O maser emission, and that the line profile of the H2O maser source in the M33 H II region IC 133 changed significantly over one year, while the maximum flux remained about the same. The detected H2O maser sources are shown to be comparable to W51 in intensity.

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