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Date and Time of the Query: 2019-04-23 T12:05:06 PDT
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For refcode 1994A&A...283...12B:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1994A&A...283...12B Multifrequency windows on spiral galaxies III. Internal extinction at optical and near-infrared wavelengths A. Boselli, and G. Gavazzi DEMIRM, Observatoire de Meudon, 5 place J. Janssen, F-92l95 Meudon Cedex, France DEMIRM, Ecole Normale Superieure, 24 rue Lhomond, F-75005 Paris, France Osservatorio Astronomico di Brera, via Brera 28, 1-20121 Milano, Italy Received January 15, accepted July l6, 1993 Abstract. We present aperture photometry data in the H, V, B and 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 ~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} > 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. Key words: ISM dust, extinction - galaxies: photometry - galaxies: spiral
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