Metals and Molecules in the Diffuse Interstellar Medium

Details Metals and Molecules in the Diffuse Interstellar Medium Metals and Molecules in the Diffuse Interstellar Medium

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21113906b&link_type=abstract

American Astronomical Society, AAS Meeting #211, #139.06; Bulletin of the American Astronomical Society, Vol. 39, p.986

Astronomy and Astrophysics

Astronomy

Scientific paper

Using archival ultraviolet (FUSE and HST/STIS) spectra, we examine the relationships between the depletions of metals (such as Fe, Mg and Ni), CO and H2 abundances, and dust extinction properties in the diffuse to translucent interstellar medium. We find that metal depletion correlates with average hydrogen density, as has been found before. We further identify a strong correlation between the depletions and CO/H2, which we believe serves as a probe of the denser regions where the metals are depleting. However, there is a conspicuous lack of correlations with any of the traditional measures of dust extinction, such as AV, RV, and c4, the strength of the far-ultraviolet rise. We discuss the implications for dust properties in these regions.

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