In the green valley galaxy J1237+39, both ionized and neutral gas counter-rotate relative to the stellar disc, indicating external gas accretion or minor merging.
http://adsabs.harvard.edu/abs/1989A
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HII versus HI in the `green valley' galaxies: direct comparison
In the green valley galaxy J1237+39, both ionized and neutral gas counter-rotate relative to the stellar disc, indicating external gas accretion or minor merging.