Dust Properties in the FUV in Ophiuchus

Abstract

We have derived the albedo ($a$) and phase function asymmetry factor ($g$) of interstellar dust grains at 1100 Å~ using archival {\it Voyager} observations of diffuse radiation in Ophiuchus. We have found that the grains are highly forward scattering with $g=$ 0.55 $\pm$ 0.25 and $a=$ 0.40 $\pm$ 0.10. Even though most of the gas in this direction is in the Ophiuchus molecular cloud, the diffuse FUV radiation is almost entirely due to scattering in a relatively thin foreground cloud. This suggests that one cannot assume that the UV background is directly correlated with the total amount of gas in any direction.

arXiv comment11 pages, 7 figures, 2 tables, ApJ, accepted

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