Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...361..132l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 361, Sept. 20, 1990, p. 132-144.
Astronomy and Astrophysics
Astrophysics
31
Astronomical Spectroscopy, Far Infrared Radiation, H Ii Regions, Infrared Spectroscopy, Interstellar Matter, Star Formation, Carbon, Fine Structure, Forbidden Transitions, Molecular Clouds, Oxygen Spectra, Silicon
Scientific paper
Far-IR line and continuum observations of the DR 21 star formation region are presented. It is shown that the extended emission in the 63 micron forbidden O I, 35 micron forbidden Si II, and 158 micron forbidden C II lines is most likely produced in dense, warm photodissociation regions on the surfaces of atomic and molecular clumps of size smaller than 0.6 pc. The gas temperatures in these photoelectrically heated, predominantly atomic layers are 250-500 K and are maintained by FUV fluxes 10,000 or more times the average interstellar radiation field. Gas densities in the surface layers are in the range 10,000-50,000/cu cm. The gas phase abundance of Si(+) is inferred to be about 5 x 10 to the -6th relative to hydrogen, or about 0.15 of its solar abundance. The mass of atomic gas is at least 200 solar masses.
Erickson Edwin F.
Haas Michael R.
Hollenbach David J.
Lane Adair P.
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