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Maser radiation from collisionless shocks: application to astrophysical jets

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摘要

This paper describes a model of electron energization and cyclotron maser emission applicable to astrophysical magnetised collisionless shocks. It is motivated by the work of Begelman, Ergun and Rees who argued that the cyclotron maser instability occurs in localised magnetised collisionless shocks such as those expected in Blazar jets. We report on recent research carried out to investigate electron acceleration at collisionless shocks and maser radiation associated with the accelerated electrons. We describe how electrons accelerated by lower-hybrid waves at collisionless shocks generate cyclotron maser radiation when the accelerated electrons move into regions of stronger magnetic fields. The electrons are accelerated along the magnetic field and magnetically compressed leading to the formation of an electron velocity distribution having a horseshoe shape due to conservation of the electron magnetic moment. Under certain conditions the horseshoe electron velocity distribution function is unstable to the cyclotron maser instability.

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作者单位:

    University of Strathclyde
    Rutherford Appleton Laboratory
    University of Strathclyde
    University of Strathclyde
    West Virginia University
    University of St Andrews
    University of Oxford
    Universidade de Lisboa
    Rutherford Appleton Laboratory
    Rutherford Appleton Laboratory
    Rutherford Appleton Laboratory
    LULI
    University of Oxford
    University of Arizona
    University of Oxford
    National Central University
    University of Oxford
    Kyushu University
    University of Oxford
    Queens University Belfast
    Institute of Laser Engineering, Osaka University
    University of Oxford
    Science and Technology Facilities Council
    Laboratoire pour l’Utilisation Des Laser Intense
    Instituto Superior Tecnico
    University of Chicago
    University of Chicago
    Imperial College London

引用该论文

Speirs David,Bingham Robert,Ronald Kevin,Phelps Alan,Koepke Mark,Cairns Alan,Rigby Alexandra,Cruz Fábio,Trines Raoul,Bamford Ruth,Kellett Barry,Albertazzi Bruno,Cross Joseph,Fraschetti Federico,Graham Peter,Kozlowski Pawel,Kuramitsu Yasuhiro,Miniati Francesco,Morita Taichi,Oliver Matthew,Reville Brian,Sakawa Youichi,Sarkar Subir,Spindloe Christopher,Koenig Michel,Silva Luis O.,Lamb Don,Tzeferacos Petros,Lebedev Sergey,Gregori Gianluca. Maser radiation from collisionless shocks: application to astrophysical jets[J].High Power Laser Science and Engineering,,():.