Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...105..372m&link_type=abstract
Astronomy and Astrophysics, vol. 105, no. 2, Jan. 1982, p. 372-388.
Astronomy and Astrophysics
Astrophysics
227
Cosmic Dust, Diffuse Radiation, Far Infrared Radiation, Galactic Radiation, Milky Way Galaxy, Submillimeter Waves, Absorption Cross Sections, Galactic Evolution, Gas Density, H I Regions, H Ii Regions, Hydrogen Ions, Interstellar Matter, Radiation Distribution, Temperature Distribution, Temperature Effects
Scientific paper
The origin of the observed FIR/submm (not less than 40 microns) radiation of the Galaxy is examined. It is suggested that most of the radiation is produced by dust heated in extended low-density H II regions, with the very long-wavelength portion of greater than 200 microns arising from dust in H I regions with a radiation field similar to that in the solar neighborhood. The absorption cross section of interstellar dust from about 0.02 to 1000 microns is calculated, and it is predicted that the dust temperature in the H I regions is approximately constant throughout the galaxy, with dust in neutral gas too cool everywhere to provide the bulk of the observed FIR. The observed spectrum of the diffuse galactic FIR/submm emission is fitted with the MRN dust model and with column densities of atomic and ionized hydrogen, which agree with other estimates of these quantities.
Mathis John S.
Mezger Peter G.
Panagia Nino
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