Hydromagnetic acceleration in relativistic outflows

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

We demonstrate that hydromagnetic acceleration can be the driving mechanism of relativistic outflows in AGNs as well as in Gamma-ray burst sources and Crab-like pulsars. Using semianalytical solutions of the full set of the steady, axisymmetric, ideal hydromagnetic equations in flat spacetime-i.e., solving the momentum equation along the flow as well as in the transfield direction-we model the acceleration of relativistic outflows. We find that a Poynting-flux dominated flow near the source reaches equipartition between matter and magnetic energy-fluxes, or even becomes completely matter-dominated (as in the case of Crab-like pulsar winds).

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