Synchrotron emission from a nearby zone of SgrA$^*$

TL;DR

This paper proposes that quasi-linear diffusion driven by cyclotron instability could generate synchrotron emission in the hard X-ray band from electrons near SgrA*, with electrons reaching relativistic energies of about 10^8.

Contribution

It introduces a mechanism involving QLD for synchrotron emission in SgrA*'s vicinity, highlighting its potential to produce high-energy X-ray radiation.

Findings

Electrons with relativistic factors of about 10^8 can emit synchrotron radiation.

QLD driven by cyclotron instability can cause pitch angle scattering necessary for synchrotron emission.

The model explains possible X-ray emission from the nearby zone of SgrA*.

Abstract

Quasi-linear diffusion (QLD), driven by the cyclotron instability, is proposed as a mechanism for the possible generation of synchrotron emission in the nearby zone of SgrA$^*$. For physically reasonable parameters, the QLD, by causing non-zero pitch angle scattering lets electrons with the relativistic factors of the order of $10^8$ emit synchrotron radiation in the hard $X$-ray spectral band $\sim120$ keV.