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Spiral Galaxy Arm's magnetic Fields

An interesting conclusion after a study of IC342, a large obscured, nearby spiral galaxy:

excerpt ===
"Spiral arms can hardly be formed by gravitational forces alone," continues Rainer Beck. "This new IC 342 image indicates that magnetic fields also play an important role in forming spiral arms."
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excerpt from NOAO===

Spiral Galaxy IC342 is located roughly 11 million light-years from Earth. Its face-on appearance in the sky—as opposed to our tilted and edge-on views of many other nearby galaxies, such as the large spiral galaxy Andromeda (M31)—makes IC342 a prime target for studies of star formation and astrochemistry.
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excerpt from another source===

[This] galaxy is obscured by the dust in our galaxy by nearly three full magnitudes. If it weren’t for this dimming effect, IC342 would be one of the finest and brightest face-on spirals in the sky and easily visible to the unaided eye in dark sky. That would make it by far the most distant object you could see with the unaided eye.
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my comment:

The study's conclusion is important but cosmologists ignored it. Dark matter is still assumed to cause any structure in a spiral arm.

The study of IC342 indicates we are still learning about the spiral arms.

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