Landing page for project EK046

We have recently discovered significant VLBI-Gaia offsets of AGN positions which are directed predominantly upstream and downstream the parsec-scale jet. They are explained by relative contribution of bright extended jets and accretion disks to the total optical emission. The most intriguing question left is how to generate the shifts when optical emission comes predominantly from the nucleus (disk dominates) while radio emission is shifted by 1-2 mas downstream the jet. The value of the offset is too large and can not be explained by synchrotron opacity or non-point-like VLBI structure. The proposed 18, 13, 6, 4, and 1.3 cm observations of the sample of 50 AGN will provide all necessary information to resolve this mystery.

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