Ammonia excitation - The absorbing cloud toward W3 /OH/

Astronomy and Astrophysics – Astrophysics

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Ammonia, Hydroxyl Emission, Interstellar Matter, Molecular Absorption, Molecular Clouds, Molecular Excitation, Absorption Spectra, Hyperfine Structure, Metastable State, Molecular Energy Levels, Molecular Rotation

Scientific paper

New measurements are presented of four NH3 metastable and non-metastable absorption lines toward W3(OH), and these data are combined with previous results. It is confirmed that the size of the absorption region is 1 arcsec. The rotational temperatures between various combinations of these lines are all equal to 50 K, which suggests that collisions are the dominant source of excitation; the density of molecular hydrogen is equal to or greater than 10 to the 7th per cu cm. Possible excitation by far infrared radiation is also discussed. The mass of the absorbing cloud is not less than one solar mass, and it may be in equilibrium. The cloud may be associated with some or all of the OH maser sources. The concentration of ammonia relative to molecular hydrogen is less than or equal to 6 x 10 to the -8th and the ratio of ortho to para-NH3 column densities agrees with LTE.

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