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A New Estimate for the Dispersion Velocity of Galactic Dark Matter Particles

An independent method is proposed to estimate the dispersion velocity of galactic dark matter particles. This method is based on the observed quasar-galaxy association samples that are caused by gravitational lensing. All resulting dispersion velocities are much higher than similar 220 km·s-1, a value expected from the virial theorem, which shows that the conventional assumption of virialization may be invalid in the halo regions of galaxies.