A 2D chemical evolution model shows that spiral density waves produce azimuthal oxygen abundance differences that are small at present and erased within a few billion years, implying observed variations require young spiral arms.
C., Ryan-Weber E.
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2D-Galactic chemical evolution: the role of the spiral density wave
A 2D chemical evolution model shows that spiral density waves produce azimuthal oxygen abundance differences that are small at present and erased within a few billion years, implying observed variations require young spiral arms.