Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...283...12b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 283, no. 1, p. 12-20
Astronomy and Astrophysics
Astrophysics
37
Infrared Photometry, Interstellar Extinction, Spiral Galaxies, Stellar Color, Stellar Spectrophotometry, Visible Spectrum, Astronomical Models, Brightness Distribution, Galactic Structure, Interstellar Matter
Scientific paper
We present aperture photometry data in the H, V, Band U bands of about 100 spiral galaxies belonging to 8 nearby clusters and to the Coma Supercluster. The data are used in conjunction with other measurements available in the literature to study, for the first time on the same set of approximately 500 galaxies, the internal extinction in spiral disks in the H, V, B and U bands. We study the color(V-H, B-H, U-H) inclination relation to determine the color-extinction coefficients. We derive the lower limits to the internal extinction coefficients at optical wavelengths assuming that galaxies are fully transparent in the H band. In the opposite assumption that galaxies are optically thick in the blue we use the surface brightness--inclination relation to derive the upper limits to the above parameters. Assuming a sandwich model for the distribution of stars and of the absorbing dust, we find that both sets of parameters are consistent with tau greater than 1 in the optical. The ratio of the dust to star z-scales decreases with increasing wavelength, indicating that the thickness of the distribution of the young stars is narrower than that of the old stars. We also find that the face-on extinction correction is not negligible.
Boselli Alessandro
Gavazzi Giuseppe
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