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16 April 2024 |
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Article overview
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Nonradial and nonpolytropic astrophysical outflows. X. Relativistic MHD rotating spine jets in Kerr metric | | L. Chantry
; V. Cayatte
; C. Sauty
; N. Vlahakis
; K. Tsinganos
; | | Date: |
15 Dec 2017 | | Abstract: | High resolution radio imaging of AGN have revealed that some sources present
motion of superluminal knots and transverse stratification of their jet. Recent
observational projects have provided new observational constraints on the
central region of rotating black holes in AGN, suggesting that there is an
inner- or spine-jet surrounded by a disk wind. This relativistic spine-jet is
likely to be composed of electron - positron pairs extracting energy from the
black hole. In this article we present an extension and generalization to
relativistic jets in Kerr metric of the meridional self similar mechanism. We
aim at modeling the inner spine-jet of AGN as the relativistic light outflow
emerging from a spherical corona surrounding a Kerr black hole. The model is
built by expanding the metric and the forces with colatitude to first order in
the magnetic flux function. Conversely to previous models, effects of the light
cylinder are not neglected. Solutions with high Lorentz factor are obtained and
provide spine-jet models up to the polar axis. As in previous publications, we
calculate the magnetic collimation efficiency parameter, which measures the
variation of the available energy across the field lines. This collimation
efficiency is an integral of the model, generalizing to Kerr metric the
classical magnetic rotator efficiency criterion. We study the variation of the
magnetic efficiency and acceleration with the spin of the black hole and show
their high sensitivity to this integral. These new solutions model collimated
or radial, relativistic or ultra-relativistic outflows. We discuss the
relevance of our solutions to model the M87 spine-jet. We study the efficiency
of the central black hole spin to collimate a spine-jet and show that the jet
power is of the same order with that determined by numerical simulations. | | Source: | arXiv, 1712.5589 | | Services: | Forum | Review | PDF | Favorites | |
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