Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...280..592d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 280, no. 2, p. 592-598
Astronomy and Astrophysics
Astrophysics
1
Hydroxyl Emission, Infrared Lasers, Interstellar Masers, Interstellar Matter, Molecular Clouds, Molecular Interactions, Abundance, Molecular Energy Levels, Rotational Spectra, Temperature
Scientific paper
In the course of modeling OH maser emission associated with star forming regions, an extensive regime was discovered in which substantial and persistent inversions in certain far-infrared (FIR) transitions were found. This has not previously been noted either in models or in observations. The conditions required are those of H2 number densities up to 5 x 108/cubic cm and kinetic and local dust temperatures up to 125 K. These conditions are not significantly more extreme than those believed to be present in hot, dense regions of molecular gas clouds associated with H II regions. The transitions involved, F2 J = 7/2 -- F1 J = 9/2 and F2 J = 5/2 -- F1 J = 7/2, occur at 135 and 115 micrometers respectively. Predicted fluxes may be detectable at present with the Kuiper Airborne Observatory (KAO) and would be readily detectable with the Infrared Space Observatory (ISO) satellite.
Doel R. C.
Field David
Gray Malcolm D.
Jones K. N.
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