Relativistic jets in active galactic nuclei: time variability
Résumé
We show that a jet in an active galactic nucleus (AGN) is produced by a rotating massive black hole. The jet contains relativistic protons accelerated by the corotating radial magnetic field, which is brought to the black hole horizon by the accreting disc matter. The Lorentz factor of protons at the light cylinder surface can gain a value of gamma as high as ~= 105. The main proton energy is in the azimuthal rotation, and only a small part is in the radial motion. The jet matter, flowing out slowly behind the light cylinder, vr = cgamma-1/2, is accelerated moving in the expanding poloidal magnetic field (magnetic nozzle) and it obtains a longitudinal Lorentz factor of Gamma ~= (B/BL)-1/2
Domaines
Astrophysique [astro-ph]
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