Speaker
Description
In the 1960s, Third Cambridge Catalogue (3C) provided the first demonstration of radio galaxies (RGs). Radio galaxies with active nuclei were soon classified as Fanaroff-Riley (FR) type I or II. Most of our knowledge on RGs have come through these powerful sources. However, advances in observational techniques have revealed that the majority of the jetted AGN population in the local universe is dominated by “miniature” versions of RGs. These miniature RGs (MiRG) generally show no extension in radio images with arcsecond resolution and too low a radio power to be nascent versions of the 3C sources. Still, they occupy the same host galaxies as the more powerful 3C/FRI sources, show similar distribution of BH masses and even display the same correlation between radio and optical luminosities, extending the one observed for 3C/FRI to lower radio powers. In light of these similarities, reinforcing the hypothesis of a single accretion/ejection mechanism across radio galaxies of all powers, these compact sources were labelled as Fanaroff Riley 0 (FR0). FR0s were identified at even lower radio powers in sources categorised as Core Galaxies. The large abundance of these sources and their similarities to FR-I RGs, together with the fact that all RGs detected at VHE to date are low-power FRI RGs, highlights their importance as a potential population of HE/VHE emissions. In addition, the enhanced sensitivities of upcoming facilities, such as the prototype large-size telescopes of the Cherenkov Telescope Array will significantly improve our observational capabilities and allow for detection of more such sources. In this contribution, I will present a large sample of MiRG and discuss their high-energy properties, placing them in the broader context of traditional FR RGs. I will also discuss the possibility of identifying new such sources at HE/VHE domain, building upon the few sources that have been detected.
