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Synchrotron-to-curvature transition regime of radiation of charged particles in a dipole magnetic field

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons37752

Prosekin,  Anton
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30663

Kelner,  Stanislav R.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;
Research Nuclear University (MEPHI), Kashirskoe shosse 31, 115409 Moscow, Russia;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30244

Aharonian,  Felix A.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;
Dublin Institute for Advanced Studies, 31 Fitzwilliam Place, Dublin 2, Ireland;

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Volltexte (frei zugänglich)

1305.0783.pdf
(Preprint), 810KB

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Zitation

Prosekin, A., Kelner, S. R., & Aharonian, F. A. (2013). Synchrotron-to-curvature transition regime of radiation of charged particles in a dipole magnetic field. Retrieved from http://arxiv.org/abs/1305.0783.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0014-B06F-1
Zusammenfassung
The details of trajectories of charged particles become increasingly important for proper understanding of processes of formation of radiation in strong and curved magnetic fields. Because of damping of the perpendicular component of motion, the particle's pitch angle could be decreased by many orders of magnitude leading to the change of the radiation regime -- from synchrotron to the curvature mode. To explore the character of this transition, we solve numerically the equations of motion of a test particle in a dipole magnetic field, and calculate the energy spectrum of magnetic bremsstrahlung self-consistently, i.e. without a priori assumptions on the radiation regime. In this way we can trace the transitions between the synchrotron and curvature regimes, as well as study the third (intermediate or the so-called synchro-curvature) regime. We briefly discuss three interesting astrophysical scenarios, the radiation of electrons in the pulsar magnetosphere in the polar cap and outer gap models, as well as the radiation of ultrahigh energy protons in the magnetosphere of a massive black hole, and demonstrate that in these models the synchrotron, synchro-curvature and curvature regimes can be realized with quite different relative contributions to the total emission.