Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978sva....22..266z&link_type=abstract
(Astronomicheskii Zhurnal, vol. 55, May-June 1978, p. 465-471.) Soviet Astronomy, vol. 22, May-June 1978, p. 266-269. Translati
Astronomy and Astrophysics
Astronomy
5
Galactic Radiation, Interstellar Extinction, Spiral Galaxies, Astronomical Models, Colorimetry, Electromagnetic Absorption, Optical Thickness, Spatial Distribution
Scientific paper
An attempt is made to evaluate the average optical depth, intrinsic extinction, and color excesses of spiral galaxies. The analysis is based on the known statistical relations between galactic luminosity and color indices on the one hand and the angle of inclination of the galactic plane to the line of sight on the other. It is shown that the observed relations may be explained by assuming that a significant fraction of the interstellar dust in the galaxies is distributed over the entire thickness of a stellar disk rather than concentrated in thin layers. The best agreement with observations of edge-on galaxies is obtained with a mean visual extinction of 0.3 mag for Sa and Sb galaxies and of approximately 0.5 mag for Sc and Sd galaxies. The corresponding values of optical depth and E(B-V) and E(U-V) color excesses are computed as functions of angle of inclination.
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