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| Diffuse UV Background: GALEX Results |
| Category:
16. The Interstellar Medium - Galactic & Extra-galactic, Molecular Clouds, |
Richard C. Henry1, N. V. Sujatha2, J. Murthy2, L. Bianchi1
1Johns Hopkins Univ., 2Indian Institute of Astrophysics, India. |
| Presentation Number: 044.06 |
| We have used the Ultraviolet cameras of the GALEX satellite to image the diffuse UV background radiation in the direction of a high-galactic-latitude dense dust cloud that was discovered in 1976 by Allan Sandage (AJ 81, 954, 1976). The presence of the dust cloud allows us to test the source of any observed background radiation: in particular, to test whether the radiation is local, or is extragalactic. Sandage estimated the distance of the dust cloud to be 100 pc. We know from previous work that some of the UV background is dust-scattered starlight; we will be able to tell if such a contribution is present. A strong such contribution is present in the visible, for that is how Sandage discovered the presence of the dust. The dust is prominent in IRAS images; examination of all the IRAS images shows that the Sandage cloud is probably the best candidate for testing the galactic-or-extragalactic character of the ultraviolet background. |
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