Physics
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8689r&link_type=abstract
HST Proposal ID #8689
Physics
Hst Proposal Id #8689 Galaxies
Scientific paper
We propose UV spectroscopy of bright inner parts of two dusty elliptical galaxies to study their ultraviolet extinction, in particular the 2175 Angstrom bump. These galaxies are selected from a sample of dusty ellipticals having very different, and in some cases highly chromatic extinction law in the visible {Goudfrooij et al. 1994}. A chromatic extinction law requires either a deficiency of carbonaceous grains or a smaller typical grain size relative to Milky Way dust. The strength of the 2175 Angstrom feature, which is due to carbon grains, is the best way to distinguish between these two possibilities. A smaller typical grain size can come about due to grain erosion by x-ray gas, or due to lack of grain growth in dense molecular clouds. A deficiency of carbonaceous grains could come about due to chemical sputtering by hydrogen or due to reduced production of carbonaceous grains by aging stellar populations. These observations will distinguish between different physical explanations for anomalous optical extinction properties, and will thereby constrain the evolutionary history and physical conditions in the interstellar media of elliptical galaxies.
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