Dust-Scattered Ultraviolet Halos around Bright Stars

Details Dust-Scattered Ultraviolet Halos around Bright Stars Dust-Scattered Ultraviolet Halos around Bright Stars

2010-11-27

arxiv.org/abs/1011.5982v2

ApJ 2011, 734, 13

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

Accepted Astrophysical Journal; 19 pages; 7 figures; online data

Scientific paper

10.1088/0004-637X/734/1/13

We have discovered ultraviolet halos extending as far as 5{\deg} around four (of six) bright UV stars using data from the GALEX satellite. These halos are due to the scattering of the starlight from nearby thin, foreground dust clouds. We have placed limits of 0.58 $\pm$ 0.12 and 0.72 $\pm$ 0.06 on the phase function asymmetry factor (g) and limits on the albedo of 0.10 $\pm$ 0.05 and 0.26 $\pm$ 0.10 in the FUV (1521 {\AA}) and NUV (2320 {\AA}) bands, respectively. We suggest that these halos are a common feature around bright stars and may be used to explore the scattering function of interstellar grains at small angles.

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