The extinction by dust in the outer parts of spiral galaxies

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dc.creatorPeletier, R. F.
dc.creatorValentijn, E. A.
dc.creatorMoorwood, A. F. M.
dc.creatorFreudling, W.
dc.creatorKnapen, J. H.
dc.creatorBeckman, J. E.
dc.date1995-06-20
dc.date.accessioned2026-07-07T02:19:53Z
dc.date.available2026-07-07T02:19:53Z
dc.descriptionTo investigate the distribution of dust in Sb and Sc galaxies we have analyzed near-infrared and optical surface photometry for an unbiased sample of 37 galaxies. Since light in the $K$-band is very little affected by extinction by dust, the $B-K$ colour is a good indicator of the amount of extinction, and using the colour-inclination relation we can statistically determine the extinction for an average Sb/Sc galaxy. We find in general a considerable amount of extinction in spiral galaxies in the central regions, all the way out to their effective radii. In the outer parts, at D$_{K,21}$, or at 3 times the typical exponential scale lengths of the stellar distribution , we find a maximum optical depth of 0.5 in $B$ for a face-on galaxy. If we impose the condition that the dust is distributed in the same way as the stars, this upper limit would go down to 0.1.
dc.description4 pages, postscript, gzip-compressed, uuencoded, includes 2 figures. Accepted for publication in Astronomy & Astrophysics, Letters
dc.identifierhttps://arxiv.org/abs/astro-ph/9506108
dc.identifierhttp://arxiv.org/abs/astro-ph/9506108
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/10039
dc.subjectAstrophysics
dc.titleThe extinction by dust in the outer parts of spiral galaxies
dc.typetext

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