Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21345417v&link_type=abstract
American Astronomical Society, AAS Meeting #213, #454.17; Bulletin of the American Astronomical Society, Vol. 41, p.353
Astronomy and Astrophysics
Astronomy
Scientific paper
Interstellar dust grains in the Galaxy remain enigmatic, despite their ubiquity. Many viable models exist, based on available IR-UV data and assumed elemental abundances. However, the abundances, which are perhaps the most stringent constraint, are not well known; modelers must use proxies in the absence of direct measurements for the diffuse interstellar medium (ISM). Recent revisions of these proxy values have only added to confusion over which is the best representative for the diffuse ISM, and highlighted the need for direct, high signal-to-noise measurements from the ISM itself. The International X-ray Observatory's superior facilities will enable high-precision elemental abundance measurements both from line-of-sight absorption and from scattered dust halos seen as a function of energy. We will show how these results will measure both the overall ISM abundances and constrain dust models, allowing us to construct a more realistic picture of the ISM.
Smith Rachel
Valencic Lynne A.
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