Spiral Density Wave ·
The Galactic Traffic Jam
un
seel
.com · pattern speed · corotation · winding problem
Pattern Ω_p
slow · rigid
Material Ω(R)
fast · differential
State
—
Disk stars (flow through)
Density-wave arms (pattern)
Shock-compressed gas
Corotation circle
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.com · Spiral Density Wave