Landing page for project EB113

Low-luminosity active galactic nuclei (LLAGN) are the most prevalent type of AGN in the local universe. They are characterized by sub-Eddington accretion regimes, low bolometric luminosities, and modest radio powers. VLBI observations of LLAGN revealed parsec and sub-parsec scales jets, emerging from dominant radio cores. Compact jets in LLAGN are intrinsically weak and likely observed at large viewing angles, making their detection in the gamma-ray band challenging. Therefore, the first detection of TeV emission from a LLAGN, NGC4278, by the LHAASO collaboration marks a significant milestone in our knowledge of the physics behind such compact, low power sources. Past VLBA at 5 and 8.4 GHz observations of NGC4278 revealed two compact jets (~1.5 pc) emerging from a compact dominant core. The jets appear constituted of individual young (<100 yrs) blob-like components. In this proposal, we ask for dual-frequency EVN observations of NGC 4278 at 5 and 8.4 GHz, six months apart, to study the jet morphology evolution on months and years time scales. New EVN observations are crucial to further investigate the physical properties of NGC4278 on VLBI scale, hence to unveil the origin of the TeV flare.

This data is part of the archive of VLBI data maintained by JIVE on behalf of the EVN, a network of radio telescopes located primarily in Europe and Asia, with additional antennas in South Africa. The EVN archive itself has the DOI https://doi.org/10.17616/R3Z197