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  Charged-starved, Relativistic Jets and Blazar Variability

Kirk, J. G., & Mochol, I. (2011). Charged-starved, Relativistic Jets and Blazar Variability. The Astrophysical Journal, 729(2): 104, pp. 1-7. doi:10.1088/0004-637X/729/2/104.

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 Urheber:
Kirk, John G.1, Autor           
Mochol, Iwona1, Autor           
Affiliations:
1Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society, ou_904550              

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Schlagwörter: BL Lacertae objects: individual (PKS2155-304); galaxies: jets; gamma rays: galaxies; magnetohydrodynamics (MHD); plasmas; waves
 Zusammenfassung: 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

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Sprache(n): eng - English
 Datum: 2011-02-15
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: eDoc: 532693
DOI: 10.1088/0004-637X/729/2/104
 Art des Abschluß: -

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Titel: The Astrophysical Journal
  Alternativer Titel : ApJ
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 729 (2) Artikelnummer: 104 Start- / Endseite: 1 - 7 Identifikator: -