Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...143..327m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 143, no. 2, Feb. 1985, p. 327-333. Research supported by the University of Kee
Astronomy and Astrophysics
Astronomy
2
Cosmic Dust, Galactic Nuclei, Galactic Radiation, Infrared Astronomy, Interstellar Matter, Seyfert Galaxies, Astronomical Models, Emission Spectra, Galactic Structure, Graphite, Mass Ratios, Radiant Flux Density, Silicates
Scientific paper
The nonvariable infrared radiation from the nucleus of NGC 4151 is discussed in terms of radiation from circumnuclear dust heated by nuclear radiation. The dust is modeled by a spherical shell and by a torus, both consisting of silicate and graphite dust grains similar to those found in the Galaxy. The model predictions are compared with the observations in an attempt to determine some parameters of the circumnuclear dust. The comparison indicates a spherical shell rather than a torus with a silicate-to-graphite dust-mass ratio of 90:10, an inner radius of about 4 pc, and an outer radius of 20 pc or more. It is proposed that the outer radius could be determined observationally, and that the silicate-to-graphite mass ratio of dust in the spiral arms of NGC 4151 could be determined from far-infrared observations.
Evans Aaron
Mayes A. J.
Pearce Geoffrey
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