Spatial distribution and nature of H_2_O masers in Messier 82.

Details Spatial distribution and nature of H_2_O masers in Messier 82. Spatial distribution and nature of H_2_O masers in Messier 82.

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...316..188b&link_type=abstract

Astronomy and Astrophysics, v.316, p.188-195

Astronomy and Astrophysics

Astrophysics

18

Galaxies: Individual: M 82, Masers: H_2_O, Oh, Star Formation Rate, Galaxies: Ism, Galaxies: Nuclei

Scientific paper

We have mapped the distribution of 22 GHz H_2_O masers in the nuclear region of M 82 where enhanced star formation and bright molecular clouds are observed. We have used different configurations of the Very Large Array interferometer and detected H_2_O emission with the C configuration. We have covered the velocity range 63 to 377km/s, and four, most likely six, H_2_O maser centers have been identified. In five other directions lying along the major axis of M 82, four H_2_O features have been marginally detected. Two of the detected H_2_O sources coincide within the uncertainties with two well known OH masers. These H_2_O sources are closely associated with two continuum sources which seem to be giant H II regions or clusters of compact H II regions. All of the H_2_O sources coincide with, or lie in the immediate vicinity of dense molecular complexes mapped with the IRAM interferometer. The H_2_O masers in M 82 have general properties quite similar to those of our Galaxy, and in this respect M 82 is not an outstanding galaxy. Isotropic luminosity, time variability and spatial distribution of H_2_O sources are not markedly different from what is observed in the Galaxy. We believe that the H_2_O masing centers observed in M 82 mark sites of current star formation, whereas the supernova remnants mark a more advanced stage of stellar evolution and apparently lie at the periphery of the molecular clouds.

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