A merger-based dynamical model of M31, calibrated to its rotation curve, gives a total mass of 4.5e11 solar masses within 137 kpc and a 68% dark matter fraction.
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Dark matter fraction derived from the M31 rotation curve
A merger-based dynamical model of M31, calibrated to its rotation curve, gives a total mass of 4.5e11 solar masses within 137 kpc and a 68% dark matter fraction.