Kinetic simulations of relativistic magnetic reconnection with synchrotron and inverse Compton cooling
Abstract
First results are presented from kinetic numerical simulations of relativistic collisionless magnetic reconnection in a pair plasma that include radiation reaction from both synchrotron and inverse Compton (IC) processes, motivated by nonthermal highenergy astrophysical sources, including in particular blazars. These simulations are initiated from a configuration known as `ABC fields' that evolves due to coalescence instability and generates thin current layers in its linear phase. Global radiative efficiencies, instability growth rates, timedependent radiation spectra, lightcurves, variability statistics and the structure of current layers are investigated for a broad range of initial parameters. We find that the IC radiative signatures are generally similar to the synchrotron signatures. The luminosity ratio of IC to synchrotron spectral components, the Compton dominance, can be modified by more than one order of magnitude with respect to its nominal value. For very short cooling lengths, we find evidence for modification of the temperature profile across the current layers, no systematic compression of plasma density and very consistent profiles of the scalar product E \middot B of electric field E and magnetic field B. We decompose the profiles of E \middot B with the use of the Vlasov momentum equation, demonstrating a contribution from radiation reaction at the thickness scale consistent with the temperature profile.
 Publication:

Journal of Plasma Physics
 Pub Date:
 June 2018
 DOI:
 10.1017/S0022377818000624
 arXiv:
 arXiv:1805.11102
 Bibcode:
 2018JPlPh..84c7501N
 Keywords:

 astrophysical plasmas;
 plasma simulation;
 Astrophysics  High Energy Astrophysical Phenomena;
 Physics  Plasma Physics
 EPrint:
 18 pages, 6 figures, accepted for publication in the Journal of Plasma Physics, special collection "Plasma physics under extreme conditions: from highenergydensity experiments to astrophysics", Eds. F. Fiuza, R. D. Blandford &