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We investigate particle and photon motion in the vicinity of a static andspherically symmetric black hole surrounded by perfect fluid dark matter in thepresence of an external asymptotically uniform magnetic field. We determine theradius of the innermost stable circular orbit (ISCO) for charged test particlesand the radius for unstable circular photon orbits and show that the effect ofthe presence of dark matter shrinks the values of ISCO and photon sphere radii.Based on the analysis of the ISCO radius we further show that the combinedeffects of dark matter and magnetic field can mimic the spin of a Kerr blackhole up to $ a/M \approx 0.75-0.8$. Finally, we consider the effect of thepresence of dark matter on the center of mass energy of colliding particles inthe black hole vicinity. We show that the center of mass energy grows as thevalue of the dark matter parameter increases. This result, in conjunction withthe fact that, in the presence of an external magnetic field, the ISCO radiuscan become arbitrarily close to the horizon leads to arbitrarily high energythat can be extracted by the collision process, similarly to what is observedin the super-spinning Kerr case.

Effect of perfect fluid dark matter on particle motion around a static black hole immersed in an external magnetic field