Astronomy and Astrophysics – Astronomy
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....66..169a&link_type=abstract
Astronomy and Astrophysics, vol. 66, no. 1-2, May 1978, p. 169-173.
Astronomy and Astrophysics
Astronomy
44
Cosmic Dust, Hydrogen Clouds, Infrared Astronomy, Nebulae, Distribution Functions, Infrared Spectra, Interstellar Matter, Interstellar Radiation, Near Infrared Radiation, Temperature Distribution
Scientific paper
The temperature differences in the extended infrared source of M 17 cannot be ascribed to a spatial separation of warm and cool dust. They are interpreted in terms of grains with sizes of 10 A exhibiting temperature fluctuations up to about 150 K, whereas the larger, common grains have an equilibrium temperature of about 36 K. An analytical expression is derived for the temperature distribution of the particles. The absence of spatial temperature variations and the presence of 10 A particles is discussed in the context of a shock front.
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