Generation and Collimation Mechanisms of Relativistic Jets in AGN
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Date
2006-06
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Addis Ababa University
Abstract
Most of the phenomenon performed by active galaxies are left uncovered among which
highly collimated jet-like out°ows, that span hounders of Kpc to Mpc via interstellar
medium, is the one. Our current research, which is fully analytic, is targeted on
¯nding the plausible mechanism of jets generation and collimation in these Mysterious
active galaxies. In this work, Kerr geometry is preferred to describe the dynamics
of electromagnetic ¯eld and plasma °uid around rotating Kerr black hole. we ¯nd
out that the force-free region, in the immediate neighborhood of rotating black hole,
is the site where jets generation and launching are fabricated. Toroidal magnetic
¯eld and centrifugal force, on the accreting plasma °uid, are the key elements for the
generation and launching of jets. Collimation of jets is the responsibility of: magnetic
hoop stress, radiation pressure, from the accretion disk, and centrifugal force. Also,
magnetic ¯eld is found to be crucially important in extracting the spin energy of
the black hole. Energy and angular momentum are continuously supplied to the jets
through di®erential rotation
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Keywords
Relativistic Jets in AGN