# Periodic optical variability of AGN

## TL;DR

This paper provides evidence for periodic optical variability in active galactic nuclei (AGN), suggesting possible orbital motion near supermassive black holes, with implications for understanding AGN dynamics.

## Contribution

It reports the detection of significant periodicity in AGN light and radial velocity curves, indicating potential orbital motion close to supermassive black holes.

## Key findings

- Detection of periodicity in optical emission of AGN
- Evidence consistent with orbital motion near black holes
- Implications for AGN variability mechanisms

## Abstract

Here we present the evidence for periodicity of an optical emission detected in several AGN. Significant periodicity is found in light curves and radial velocity curves. We discuss possible mechanisms that could produce such periodic variability and their implications. The results are consistent with possible detection of the orbital motion in proximity of the AGN central supermassive black holes.