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