Landing page for project EN016

M84 is a nearby low-luminosity AGN with two-sided FR I radio jets on kpc- to pc-scales, and hosts a supermassive black hole of 1.5x10^9 Msun. We propose 9 hours of close-in-time multi-frequency EVN+e-MERLIN observations at 1.7, 5, 8.3, and 23 GHz. Our goal is to investigate jet collimation profile on scales of 50-1000 gravitational radii, test models such as magnetic self-collimation and confinement by accretion disc, torus, or ISM, and provide constraints on jet launching mechanisms. These observations will allow to measure core shift, jet base opacity, estimate continuum spectra, and localize the central engine. Using SED modeling with ADAF and jet models, we also aim to separate jet and accretion flow emissions, exploring disk-jet connection. This work will complement recent 86 GHz GMVA+ALMA and 230 GHz EHT+ALMA observations, as well as the upcoming 2025 EHT+ALMA campaign of M84. Given the resolution and sensitivity limitations of existing archival data, EVN+eMERLIN is essential for improved uv-coverage at short spacings, enabling deeper probing of jet collimation and ensuring high SNR detection of faint nuclear and extended jet emissions, including new jet components.

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