Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.258..725s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 258, no. 4, p. 725-737.
Astronomy and Astrophysics
Astronomy
35
Active Galactic Nuclei, Hydroxyl Emission, Interstellar Masers, Radio Astronomy, Starburst Galaxies, Infrared Astronomy Satellite, Interstellar Matter, Sky Surveys (Astronomy)
Scientific paper
A search for OH emission from luminous IRAS galaxies with the Parkes telescope has been completed. Two new megamasers were found out of 122 galaxies searched. Based on these and previous searches we discuss the required conditions for OH megamaser emission, and derive the set of variables necessary to explain the observed correlations for megamasers. New redshifts for 47 of the candidates were obtained with the 1.9-m Mt Stromlo telescope and the Anglo-Australian Telescope. Detailed spectroscopy of two of the megamaser galaxies shows them to have low-ionization emission-line nuclei, suggesting the presence of highly obscured active nuclei. Radio continuum measurements have also been made of known megamaser galaxies with the Compact Array of the Australia Telescope. The radio-infrared relation is tightly defined for megamaser galaxies. As a class they have somewhat lower 5-GHz to 60-micron flux density ratios than spiral galaxies, consistent with megamasers being found in young starburst galaxies.
Allen David A.
Chapman Jessica M.
Norris Ray P.
Roy Alan L.
Staveley--Smith Lister
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