Interstellar radiation field and dust temperatures in the diffuse interstellar matter and in giant molecular clouds

Details Interstellar radiation field and dust temperatures in the diffuse interstellar matter and in giant molecular clouds Interstellar radiation field and dust temperatures in the diffuse interstellar matter and in giant molecular clouds

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...128..212m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 128, no. 1, Nov. 1983, p. 212-229.

Astronomy and Astrophysics

Astrophysics

753

Cosmic Dust, Interstellar Matter, Interstellar Radiation, Molecular Clouds, Graphite, Radiation Distribution, Radiative Transfer, Silicates, Temperature Profiles

Scientific paper

The interstellar radiation field (ISRF) is reevaluated as a function of galactocentric distance, in view of the results of recent surveys of the 2.4 and 3.4 micron galactic emissions, far-IR surveys of the galactic plane, and an improved model of dust opacity variation in the galactic plane. A determination of the radiation field inside Giant Molecular Clouds (GMCs) as a function of both galactocentric distance and extinction, and a calculation of the dust temperatures of the Mathis-Rumpl-Nordsiek (1977) composite graphite/silicate dust model are undertaken. It is found that the ISRF, between 0.09 and 8 microns, is dominated by stellar radiation, and by reemitted radiation from dust grains between 8 and 1000 microns. The dominant sources of heating in GMCs are stellar radiation for graphite grains and far-IR heating for silicate grains. The stellar radiation absorbed in the outer layers of GMCs is almost entirely converted into far-IR radiation.

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