Quasi-linear diffusion driving the synchrotron emission in active galactic nuclei

Abstract

We study the role of the quasi-linear diffusion (QLD) in producing X-ray emission by means of ultra-relativistic electrons in AGN magnetospheric flows. We examined two regions: (a) an area close to the black hole and (b) the outer magnetosphere. The synchrotron emission has been studied for ultra-relativistic electrons and was shown that the QLD generates the soft and hard X-rays, close to the black hole and on the light cylinder scales respectively. By considering the cyclotron instability, we show that despite the short synchrotron cooling timescales, the cyclotron modes excite transverse and longitudinal-transversal waves. On the other hand, it is demonstrated that the synchrotron reaction force and a force responsible for the conservation of the adiabatic invariant tend to decrease the pitch angles, whereas the diffusion, that pushes back on electrons by means of the aforementioned waves, tends to increase the pitch angles. By examining the quasi-stationary state, we investigate a regime in which these two processes are balanced and a non-vanishing value of pitch angles is created.

4 pages, 3 figures

References in corpus (6)

• VHE Gamma-Ray Observation of the Crab Nebula and its Pulsar with the MAGIC telescope
• Variable VHE gamma-ray emission from non-blazar AGNs
• On the efficiency of particle acceleration by rotating magnetospheres in AGN
• The Plasma Emission Model of RX J1856.5-3754
• On The Recently Discovered Pulsations From RX J1856.5-3754
• On the emission polarization of RX J1856.5-3754

Cited by in corpus (7)

• Non-thermal Processes in Black-Hole-Jet Magnetospheres
• Sensitivity of synchrotron radiation to the superthermal electron population in mildly relativistic plasma
• On the simultaneous generation of high energy emission and submillimeter/infrared radiation from active galactic nuclei
• The influence of corotation on the high energy synchrotron emission in Crab-like pulsars
• Synchrotron emission driven by the Cherenkov-drift instability in active galactic nuclei
• The generation of connected high and very high energy $\gamma$-rays and radio emission in active galactic nuclei
• On the mechanism of the pulsed high energy emission from the pulsar PSR B1509-58