H2O activity in M82 and in other members of the M81 group

Details H2O activity in M82 and in other members of the M81 group H2O activity in M82 and in other members of the M81 group

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...287...20b&link_type=abstract

Astronomy and Astrophysics (ISSN 2000-6361), vol. 287, no. 1, p. 20-31

Astronomy and Astrophysics

Astronomy

5

Carbon Monoxide, Galactic Nuclei, Galaxies, Microwave Spectra, Radio Astronomy, Star Formation Rate, Variability, Water Masers, Astronomical Maps, Flux (Rate), Infrared Astronomy, Infrared Spectra, Luminosity, Spectrum Analysis, Very Large Array (Vla)

Scientific paper

We present and discuss the results of a long-term sporadic monitoring of the H2O masers observed toward the nucleus of M 82 between 1984 and 1991. Time variability is clearly established in several narrow features. In 1988 we observed a strong burst in one single component centered around 109 km/s. This component had an isotropic luminosity of about 0.17 solar luminosity at the epoch of the flares, was as narrow as approximately 0.3 km/s, and showed flux variations on a time scale of 12 days. Our observations suggest that the 109 km/s H2O maser is partly saturated with physical properties similar to the brightness H2O clumps of the Galaxy. The results of a search for H2O masers in selected positions along the arms of M 81 and toward the center of the two other major members of the M 81 group of galaxies, NGC 3077 and NGC 2976, are presented. The rms flux limit achieved during this search was about 10 to 40 mJy from which we deduce that we had no masers brighter than 0.01-0.03 solar luminosity. Our results are discussed in the light of the star formation rate for these three galaxies. Finally, the H2O and CO luminosities of the four major members of the M 81 group of galaxies and of some othe galaxies are compared to conclude that higher CO luminosities in external galaxies imply better chances to detect H2O maser activity.

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