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The discovery of Raman scattering in H II regions

Dopita, Michael; Nicholls , David; Sutherland, Ralph; Kewley, Lisa; Groves, Brent Allan


We report here on the discovery of faint extended wings of Hα observed out to an apparent velocity of ~7600 km s−1 in the Orion Nebula (M42) and in five H ii regions in the Large and the Small Magellanic Clouds. We show that these wings are caused by Raman scattering of both the O i and Si ii resonance lines and stellar continuum UV photons with H i followed by radiative decay to the H i n = 2 level. The broad wings also seen in Hβ and in Hγ result from Raman scattering of the UV continuum in...[Show more]

CollectionsANU Research Publications
Date published: 2016
Type: Journal article
Source: Astrophysical Journal Letters
DOI: 10.3847/2041-8205/824/1/L13
Access Rights: Open Access


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