Dust Properties in the Far‐Ultraviolet in Ophiuchus | Zendy

N. V. Sujatha | Zendy; P. Shalima | Zendy; Jayant Murthy | Zendy; R. C. Henry | Zendy

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Dust Properties in the Far‐Ultraviolet in Ophiuchus

Author(s) -

N. V. Sujatha,

P. Shalima,

Jayant Murthy,

R. C. Henry

Publication year - 2005

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/444532

Subject(s) - ophiuchus , physics , far ultraviolet , phase function , albedo (alchemy) , astrophysics , scattering , interstellar cloud , molecular cloud , astronomy , radiation , optics , stars , art , art history , spectral line , performance art

We have derived the albedo ($a$) and phase function asymmetry factor ($g$) ofinterstellar dust grains at 1100 \AA ~ using archival {\it Voyager}observations of diffuse radiation in Ophiuchus. We have found that the grainsare 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 Ophiuchusmolecular cloud, the diffuse FUV radiation is almost entirely due to scatteringin a relatively thin foreground cloud. This suggests that one cannot assumethat the UV background is directly correlated with the total amount of gas inany direction.Comment: 11 pages, 7 figures, 2 tables, ApJ, accepte

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