General relativistic effects in astrophysical jets

Astronomy and Astrophysics – Astronomy

Scientific paper

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Accretion Disks, Black Holes (Astronomy), Particle Trajectories, Radio Jets (Astronomy), Relativistic Effects, Gravitational Effects, Red Shift, Stellar Luminosity, Stellar Rotation

Scientific paper

General relativistic effects in the dynamics of optically thin jets are studied. Jet particles move along the rotation axis of the central compact object (Kerr black hole) in the radiation field of an accretion disk (relativistic alpha-viscosity thin disk). Attention is paid mainly to the effects in the close vicinity of the central object: what is the influence of rotation of the black hole, gravitational and Doppler redshift, and the bending of photon paths on the radiation field along particle's trajectory and how this may affect the terminal Lorentz factor of the jet. Within the model adopted, it is concluded that the most important general relativistic contribution comes only indirectly through the dependence of the local disk luminosity on the hole's rotation. These effects do not otherwise seem to affect the terminal speed of the jet significantly. Several typical particle trajectories outside of the rotation axis are constructed numerically.

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