Statistics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6438k&link_type=abstract
HST Proposal ID #6438
Statistics
Hst Proposal Id #6438 Galaxies &Amp, Clusters
Scientific paper
Pairs of overlapping galaxies offer an unusually direct way to measure the extinction within the disk of spiral galaxies, which has implications for M/L ratios, star-formation histories, and the role of galaxy obscuration in statistics of high-redshift objects. Ground-based data have allowed us to measure the extinction in several backlit spirals, as averaged over regions of hundreds of parsecs. WFPC2 imaging of three of our best candidates in B and I bands will allow us to measure the dust clumping on finer scales than possible from the ground, and to establish whether the relatively flat reddening curves we have found are indeed the product of clumping. Together with scheduled ISO observations, we should be able to establish the clumping spectrum of dust over a very wide range of scales, which is crucial to modelling the effects of dust on the emergent radiation from spiral galaxies.
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