Charge-starved jets and rapid variability in blazars

Mochol, Iwona; Kirk, John G.

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Charge-starved jets and rapid variability in blazars

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Mochol, Iwona
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Kirk, John G.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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http://pos.sissa.it/archive/conferences/123/042/Texas%202010_042.pdf
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Mochol, I., & Kirk, J. G. (2011). Charge-starved jets and rapid variability in blazars. Proceedings of Science, Texas2010: 042, 1-7.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0012-2D32-8

Abstract

Very rapid variations of the gamma-ray flux from blazars suggest that there is a mechanism at work which modulates blazar emission on timescales much smaller than the light-crossing time of the black hole’s event horizon. We propose a scenario in which blazar photons are modulated at the frequency w of a large-amplitude wave that is launched in the polar region of the central, rotating black hole, and propagates in a charge-starved jet. Using a two-fluid (e±) description, we find the outflow exhibits a delayed acceleration phase that starts when the inertia associated with the wave currents becomes important. The modulation of the emission from the accelerating jet is preserved for the observer provided that the density of pairs, produced in an electromagnetic cascade, is sufficiently low.