H2O masers in nearby irregular galaxies

Details H2O masers in nearby irregular galaxies H2O masers in nearby irregular galaxies

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...268..483b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 268, no. 2, p. 483-490.

Astronomy and Astrophysics

Astronomy

26

Interstellar Masers, Irregular Galaxies, Water Masers, Abundance, Astronomical Spectroscopy, H Ii Regions, Infrared Sources (Astronomy), Star Formation

Scientific paper

The results of a search for luminous interstellar H2O masers in 15 nearby irregular galaxies are presented. One new maser was detected in the Magellanic-type irregular galaxy IC 10. It was observed six times between 1987 and 1990 and did not exhibit flux density variations exceeding a factor of three. The newly discovered maser is located 2 arcmin to the north of another, more luminous H2O maser source, which has been monitored over a time interval of six years. The position of the v(LSR)= -332 km/s component of the more luminous maser was determined to an accuracy of about 2 arcsec. This component was undergoing a 'slow' burst during 1985 and most of 1986, with the linewidth varying as the -1/3 power of the flux density. In 1990, a strong burst was observed in the v(LSR)= -324 km/s component, which reached a flux density of 31 Jy. For this component the linewidth-flux density relation is the same within the uncertainty limits.

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