Warm dust in the neutral interstellar medium

Details Warm dust in the neutral interstellar medium Warm dust in the neutral interstellar medium

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...144l...9b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 144, no. 1, March 1985, p. L9-L12.

Astronomy and Astrophysics

Astronomy

169

Cosmic Dust, Hydrogen Clouds, Infrared Astronomy, Interstellar Extinction, Interstellar Matter, Neutral Gases, Astronomical Maps, Emission Spectra, Galactic Radiation, Heliosphere, Infrared Astronomy Satellite, Infrared Spectra

Scientific paper

A comparative study of H I and IRAS maps of a 20 x 18 deg field at high galactic latitude is presented. The galactic infrared emission is shown to be well correlated with the H I distribution. A quantitative relation between H I column density and far-infrared surface brightness is derived. From this correlation the possible use of IRAS observations to map high galactic latitude extinction is discussed. The infrared spectrum of one diffuse H I cloud, from 12 to 100 microns is presented. Its emission in the mid-infrared (12 and 25 microns) is several orders of magnitude larger than predicted by standard dust models. The power radiated at 12 microns represents 25 percent of the 100 microns emission. The spectrum presents a minimum at 25 microns. The implications of these results on interstellar dust properties are discussed.

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