The following document lists the file abstract/WKEEL_OVERLAPS.abs
from catalogue VI/111.
A plain copy of the file
(without headers/trailers) may be downloaded.
The dust content of spiral galaxies is an important, and poorly known, property. Optically backlit galaxies offer a direct way to measure the extinction through spiral disks, and give results suggesting that the dust is clumped, which is crucial to the overall effects of dust on the starlight. ISO measurements offer the opportunity for a classical test for the degree of clumping, via measurements of the same dust population in emission and in absorption. We propose ISO observations at 12,50,100, and 200 microns of the four most appropriate galaxy pairs, in which a smooth early-type galaxy shines through the disk of a reasonably symmetric foreground spiral. As long as the 200-micron band has an important contribution from the mass-dominant part of the dust distribution, we will be able to derive any of several indices of dust clumping, for input to more realistic models of the transfer of stellar radiation within galaxies.