Are rotation curves in NGC 6946 and the Milky Way magnetically supported?
Are rotation curves in NGC 6946 and the Milky Way magnetically supported?
Following the model of magnetically supported rotation of spiral galaxies, the inner disk rotation is dominated by gravity but magnetism is not negligible at radii where the rotation curve becomes flat, and indeed becomes dominant at very large radii. Values of the order of 1 $\mu$G, or even less, produce …