Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2009-01-10
Astrophys.J.Lett.692:L88-L91,2009
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
15 pages, 3 figures, accepted for publication in The Astrophysical Journal Letters
Scientific paper
10.1088/0004-637X/692/2/L88
We present a deep circular polarization image of the Orion BN/KL nebula in the Ks band and correlations of circular polarization, linear polarization, and H-Ks color representing extinction. The image of circular polarization clearly reveals the quadrupolar structure around the massive star IRc2, rather than BN. H-Ks color is well correlated with circular polarization. A simple relation between dichroic extinction, color excess, circular and linear polarization is derived. The observed correlation between the Stokes parameters and the color excess agrees with the derived relation, and suggests a major contribution of dichroic extinction to the production of circular polarization in this region, indicating the wide existence of aligned grains.
Bailey Jeremy
Fukue Tsubasa
Hashimoto Jun
Hough James H.
Kandori Ryo
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