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The discovery of Raman scattering in H II regions

Dopita, Michael A.; Nicholls, David C.; Sutherland, Ralph S.; Kewley, Lisa; Groves, Brent

Description

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...[Show more]

CollectionsANU Research Publications
Date published: 2016-06-10
Type: Journal article
URI: http://hdl.handle.net/1885/112497
Source: The Astrophysical Journal letters
DOI: 10.3847/2041-8205/824/1/L13

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