Optical and X-ray Variability of AGNs

TL;DR

This paper investigates the complex and variable relationships between optical, UV, and X-ray emissions in AGNs, highlighting both correlated long-term variability and independent short-term fluctuations, suggesting anisotropic emission as a key factor.

Contribution

It introduces new comparative analyses of AGN multi-wavelength variability, emphasizing the role of anisotropic high-energy emission in explaining observed phenomena.

Findings

X-ray and optical activity are correlated over long timescales.

Short-term variability can be independent across passbands.

Long-term correlations likely stem from a common underlying factor.

Abstract

I present new comparisons of AGN optical, UV, and X-ray variations. These reveal complex relationships between the different passbands that can change with time in a given object. While there is evidence from several objects that X-ray and optical activity levels are correlated on long timescales, variations on shorter timescales can occur independently. It is proposed that the combination of correlated and uncorrelated short-timescale variability is a consequence of anisotropic high-energy emission. It is also argued that the correlation between X-ray and optical variability on long timescales must be due to a common underlying factor and not to reprocessing of X-ray radiation.