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          Institute: MPI für Kernphysik     Collection: Theoretical Astrophysics     Display Documents

ID: 532693.0, MPI für Kernphysik / Theoretical Astrophysics
Charged-starved, Relativistic Jets and Blazar Variability
Authors:Kirk, John G.; Mochol, Iwona
Date of Publication (YYYY-MM-DD):2011-02-15
Title of Journal:The Astrophysical Journal
Journal Abbrev.:ApJ
Issue / Number:2
Start Page:1
End Page:7
Sequence Number of Article:104
Review Status:not specified
Audience:Experts Only
Abstract / Description:High energy emission from blazars is thought to arise in a relativistic jet launched by a supermassive black hole. The emission site must be far from the hole and the jet relativistic, in order to avoid absorption of the photons. In extreme cases, rapid variability of the emission suggests that structures of length-scale smaller than the gravitational radius of the central black hole are imprinted on the jet as it is launched, and modulate the radiation released after it has been accelerated to high Lorentz factor. We propose a mechanism which can account for the acceleration of the jet, and for the rapid variability of the radiation, based on the propagation characteristics of large-amplitude waves in charge-starved, polar jets. Using a two-fluid (electron-positron) description, we find the outflows exhibit a delayed acceleration phase, that starts at roughly 1pc, where the inertia associated with the wave currents becomes important. The time-structure imprinted on the jet at launch modulates photons produced by the accelerating jet provided the pair multiplicity in the black-hole magnetosphere is sufficiently small, suggesting that very rapid variability is confined to sources in which the electromagnetic cascade in the black-hole magnetosphere is not prolific
Free Keywords:BL Lacertae objects: individual (PKS2155-304); galaxies: jets; gamma rays: galaxies; magnetohydrodynamics (MHD); plasmas; waves
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group of W. Hofmann/ Theoretical Astrophysics (J. Kirk)
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