Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.258..787r&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 258, no. 4, p. 787-799.
Astronomy and Astrophysics
Astronomy
114
Cosmic Dust, Infrared Astronomy Satellite, Interstellar Matter, Milky Way Galaxy, Starburst Galaxies, Astronomical Models, Color-Color Diagram, Infrared Spectra
Scientific paper
Consideration is given to a new model for interstellar grains which was developed from a revised version of the model of Rowan-Robinson (1986). The main new features are the incorporation of very small grains (5-20 A) to explain the diffuse mid-IR emission and the addition of very large grains (30 microns) to explain excess emission at millimeter wavelengths. The model is compared to observed FIR color-color diagrams for galaxies, both for those galaxies unresolved by IRAS and for nearby resolved galaxies. The FIR spectra of the large nearby spirals mapped by IRAS, for which the emission is predominantly cirrus, are modeled in detail. Models are also given for the IR-to-submillimeter spectra of galaxies which have been mapped at 800 microns, incorporating starburst and cirrus models.
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