Far-Ultraviolet Interstellar Extinction in the Magellanic Clouds

Details Far-Ultraviolet Interstellar Extinction in the Magellanic Clouds Far-Ultraviolet Interstellar Extinction in the Magellanic Clouds

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.5901c&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #59.01; Bulletin of the American Astronomical Society, Vol. 33, p.1392

Astronomy and Astrophysics

Astrophysics

Scientific paper

Understanding interstellar dust and its role in the universe is very important. Virtually all observations of astrophysical objects and their physical processes are affected by the presence of dust either within the system being studied or along its line of sight. We are using observations of the extinction due to interstellar dust in the far ultraviolet (FUV) to significantly improve our knowledge of dust properties, specifically those of small grains. Such an advance has not been possible prior to the advent of FUSE and its unique capabilities: the high FUV throughput and the ability to resolve H2 lines, combined with a well-characterized instrumental calibration. We have derived FUV extinction curves for several types of sightlines in the Large and Small Magellanic Clouds which possess distinct signatures associated with the small grain population and whose mid-UV extinction curves reveal vastly differing amounts of intermediate-sized particles. These data will be used to probe and constrain the properties of the small dust grains, such as abundance and size, and their connection to the very different environments observed.

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