X-ray Spectral Evolution of High Energy Peaked Blazars

TL;DR

This paper reviews the X-ray spectral evolution of high energy peaked blazars, emphasizing the effectiveness of the log-parabolic model in describing their spectra and exploring parameter correlations to understand variability mechanisms.

Contribution

It provides a comprehensive review of spectral studies using the log-parabolic model and investigates parameter correlations related to blazar variability.

Findings

Log-parabolic model effectively describes blazar spectra around the peak.

Spectral parameters show correlations that shed light on variability mechanisms.

X-ray spectral curvature is linked to energy-dependent acceleration processes.

Abstract

The synchrotron hump of the high energy peaked blazars generally lies in the 0.1-10 keV range and such sources show extreme flux and spectral variability in X-ray bands. Various spectral studies showed that the X-ray spectra of high energy peaked blazars are curved and better described by the log-parabolic model. The curvature is attributed to the energy dependent statistical acceleration mechanism. In this work, we review the X-ray spectral studies of high energy peaked blazars. It is found that the log-parabolic model well describes the spectra in a wide energy interval around the peak. The log-parabolic model provides the possibility of investigating the correlation between the spectral parameters derived from it. Therefore, we compiled the studies of correlations between the various parameters derived from the log-parabolic model and their implications to describe the variability mechanism of blazars.