Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apjs...43...37e&link_type=abstract
Astrophysical Journal Supplement Series, vol. 43, May 1980, p. 37-56.
Astronomy and Astrophysics
Astrophysics
71
Astronomical Photography, Astronomical Photometry, Cosmic Dust, Galactic Structure, Interstellar Matter, Spiral Galaxies, Astronomical Models, Cloud Cover, Color Photography, Electrophotometry, Late Stars, Nebulae, Radiative Transfer
Scientific paper
A quantitative technique for determining the optical depths, densities, and geometries of dust complexes in external spiral galaxies is presented and applied to dust complexes in the late-type spiral galaxies NGC 628 (M 74), NGC 5194 (M 51), NGC 5457 (M 101) and NGC 7793. The method involves the matching of radiative transfer models to multicolor photographic and photometric observations of discrete regions, and allows the differentiation between high-opacity low-lying clouds and low-opacity, high clouds. Three main types of dust features are observed in the galaxies: (1) the most common low-density objects with extinctions about 1.5 mag greater than background which are observed in parts of dust lanes, and less common density enhancements in branches of the spiral arms; (2) discrete high-latitude low-opacity clouds; and (3) moderately dense clouds in the midplanes of some galaxies. It is also found that the variation of surface brightness with inclination for all late-type spirals can be modeled with a Gaussian dust distribution perpendicular to the plane.
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