Optical and X-ray Variability of Blazars

TL;DR

This study investigates optical and X-ray variability in three blazars, revealing large amplitude changes, spectral modeling, and polarization behavior, enhancing understanding of blazar emission mechanisms.

Contribution

It provides new insights into blazar variability, spectral energy distribution modeling, and polarization behavior using XMM-Newton observations.

Findings

Large amplitude optical to X-ray variability in 3C 273 and PKS 2155-304.

Spectral energy distribution fitted with LPPL model for PKS 2155-304.

Anti-correlation between optical flux and polarization in BL Lacertae.

Abstract

Here we report our recent results of variability studies in optical and X-ray bands of three blazars namely 3C 273, PKS 2155 - 304 and BL Lacertae with XMM-Newton. We found large amplitude optical to X-rays variability in 3C 273, and PKS 2155 - 304 on year time scale. In 3C 273, we noticed that synchrotron cooling and particle acceleration are at work at different epoch of observations. In PKS 2155 - 304, spectral energy distribution from optical to X-ray is fitted with LPPL (log parabolic + power law) model. In BL Lacertae, optical flux and degree of polarization were anti-correlated.