In a spherical potential, the circular speed satisfiesIt measures the gravitational field even when the system itself is not supported by circular motion.
vc2(r)=rdrdΦ=rGM(<r).
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- Cusped logarithmic spherical galaxy model
- Escape and circular speeds inside an isolated uniform sphere
- Inner NFW contraction to a flat rotation curve
- Jaffe model
- Mestel disk potential-density pair
- NFW mass and circular-speed profile
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- Radially anisotropic isothermal halo asymptotics
- Scale-free Kuzmin superposition
- Stellar asymmetric drift
- Streaming velocity
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