Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.258..241f&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 258, no. 2, Sept. 15, 1992, p. 241-250. Research suppor
Astronomy and Astrophysics
Astronomy
Astronomical Models, Far Infrared Radiation, Galactic Radiation, Radio Emission, Radio Galaxies, Cosmic Dust, Infrared Astronomy Satellite, Interstellar Matter
Scientific paper
The FIR color of NGC 6946 is observed to vary across the disk of the galaxy. Three models for these color variations are examined to learn about possible heating sources for the dust, and the relationship of the FIR and nonthermal radio emissions. A model with a single dust component in which the dust temperature varies with position leads to a FIR-radio correlation which shows some nonlinearity, especially in the nuclear region. Two models, each with two dust components, are also considered: one model has differing contributions of warm and cold dust (cirrus) with the temperature of each component the same throughout the galaxy, while the second allows the temperature of the cirrus component to vary with position. The two-component model with a variable cirrus temperature predicts an approximately constant cirrus dust temperature, thereby explaining the success of the two-component model with fixed dust temperatures, especially in modeling the FIR emission from samples of galaxies.
Alexander Paul
Fitt A. J.
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