Gamma-Rays from Non-Blazar AGN

TL;DR

This paper reviews recent advances in gamma-ray observations of non-blazar AGN, highlighting new insights into jet physics, spectral features, and variability in sources like Centaurus A, IC 310, and M87.

Contribution

It provides a comprehensive overview of observational and theoretical progress in gamma-ray studies of non-blazar AGN, emphasizing new spectral and variability phenomena.

Findings

Spectral hardening observed in Centaurus A

Extreme short-term variability in IC 310 and M87

Enhanced understanding of jet physics in misaligned AGN

Abstract

Non-blazar Active Galactic Nuclei (AGN) have emerged as a new gamma-ray emitting source class on the extragalactic sky and started to deepen our understanding of the physical processes and the nature of AGN in general. The detection of Narrow Line Seyfert 1 galaxies in the Fermi-LAT energy regime, for example, offers important information for our understanding of jet formation and radio-loudness. Radio galaxies, on the other hand, have become particularly interesting at high (HE) and very high (VHE) gamma-ray energies. With their jets not directly pointing towards us (i.e. misaligned), they offer a unique tool to probe into the nature of the fundamental (and often hidden) physical processes in AGN. This review highlights and discusses some of the observational and theoretical progress achieved in the gamma-ray regime during recent years, including the evidence for unexpected spectral hardening in Centaurus A and extreme short-term variability as seen in IC 310 and M87.