For 10 points, name this plot of a galaxy's orbital velocity as a function of distance from the galaxy's center.
Persic, Salucci and Stel constructed a "universal" one of these after determining that their profile and amplitude both had a strong dependence on luminosity, while Blumenthal et al used the concept of adiabatic compression to describe the unusually smooth transition between the disk and halo components of these constructs. Generally these are constructed by measuring the Doppler velocities of the 21-cm line along different lines of sight. Kepler's laws predict that the quantities related by these constructs should demonstrate an inverse square relationship, but observations by Vera Rubin have shown that the relationship is roughly linear and then flattens out completely, a problem that can be corrected by considering the existence of dark matter in the halo. For 10 points, name this plot of a galaxy's orbital velocity as a function of distance from the galaxy's center.
Persic, Salucci and Stel constructed a "universal" one of these after determining that their profile and amplitude both had a strong dependence on luminosity, while Blumenthal et al used the concept of adiabatic compression to describe the unusually smooth transition between the disk and halo components of these constructs.
{galaxy rotation curve}