Rotationally excited OH in megamaser galaxies

Details Rotationally excited OH in megamaser galaxies Rotationally excited OH in megamaser galaxies

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...185...14h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 185, no. 1-2, Oct. 1987, p. 14-24.

Astronomy and Astrophysics

Astronomy

51

Excitation, Galactic Nuclei, Hydroxyl Emission, Infrared Astronomy Satellite, Masers, Molecular Clouds, Absorption Spectra, Centimeter Waves, Flux Density, Noise Temperature

Scientific paper

Observations of six megamaser galaxies, obtained at 6 cm with system noise temperature 35 K using a 2 x 512-channel autocorrelator spectrometer at the 100-m Effelsberg radio telescope during 1985-1986, are reported. The data are presented in tables and spectra (along with 18-cm observations from Baan et al., 1985) and characterized in detail. Absorption in the 2Pi(1/2) J = 1/2 Lambda-doublet transitions of OH is detected toward five of the galaxies, with relative intensities deviating moderately from LTE and rotational temperatures near the IRAS-based dust temperature of 60 K. It is inferred that the OH megamaser emission arises within about 50-100 pc from the associated galactic nuclei due to the same pump mechanism (perhaps a radiative pump based on an intense FIR radiation field).

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