On the jitter radiation. Astrophysical Journal Volume 774, Issue 1, 1 September 2013, Article number 61

In a small-scale turbulent medium, when the nonrelativistic Larmor radius RL = mc 2/eB exceeds the correlation length λ of the magnetic field, the magnetic Bremsstrahlung radiation of charged relativistic particles unavoidably proceeds to the so-called jitter radiation regime. The cooling timescale of parent particles is identical to the synchrotron cooling time, thus this radiation regime can be produced with very high efficiency in different astrophysical sources characterized by high turbulence. The jitter radiation has distinct spectral features shifted toward high energies, compared to synchrotron radiation. This effect makes the jitter mechanism an attractive broad-band gamma-ray production channel, which, in highly magnetized and turbulent environments, can compete or even dominate over other high-energy radiation mechanisms. In this paper, we present a novel study of the spectral properties of the jitter radiation performed within the framework of perturbation theory. The derived general expression for the spectral power of radiation is presented in a compact and convenient form for numerical calculations.
Author keywords
gamma rays: general; methods: analytical; radiation mechanisms: non-thermal; turbulence