Synchrotron emission from a nearby zone of SgrA${}^{\ast }$

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${}^{\ast }$. 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 $\sim 120$ keV.

4 pages, 3 figures

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