Multiwavelength Activity of <scp>NGC</scp> 1275 Nucleus

ABSTRACT Active galactic nucleus (AGN) phenomenon and role of jets, powered by the central black hole of AGN, in the feedback of the surroundings on different scales is a matter of detailed multi‐wavelength investigations. The long‐term observations of AGN are used to reveal the processes taking place in the very proximity to the super‐massive black holes. One of the approaches to such studies is to detect the launching of jet components viewed in the radio range and then link it with flaring events detected at higher energy ranges. Tracking the jet‐initiated variability events through multiwavelength observations as well as their cross‐identification from radio frequencies up to high‐energy gamma‐rays allows one to locate the regions responsible for the generation of observable features, which can lead to the exploration of the mechanism of jet launching and the origin of emission in the Active Galactic Nucleus. Being nearby and bright, NGC 1275 is one of the extensively studied AGN. This object is very active in the timescales of decades. Multiwavelength long‐term observations of NGC 1275 resulted in the detection of different timescale variability from this AGN. For the case of NGC 1275, the cross‐correlation of the activity at radio, X‐ray, and very high‐energy gamma‐rays is investigated. The time dependence of the activity of NGC 1275 in the wide energy range was found, which allows one to localize the sites of the emission generation, including one of the very high energies. These multiwavelength long‐term studies are highly important for the further advance of the AGN's black hole research and investigations of mechanisms of jet formation.