Speaker
Description
The coordinates of the bright radio-loud active galactic nucleus (AGN) J1438+6211 (1437+624) at redshift z=1.094 are known in optical and radio wavebands with sub-milliarcsecond precision. The target shows significant offset, in the order of ~10 milliarcseconds, between its optical and radio positions. I analysed very long baseline interferometry (VLBI) radio images obtained at 5 GHz with the European VLBI Network in 2022 and archival data at multiple frequencies covering more than two decades, to investigate the possible cause of this discrepancy. I found that the radio source is resolved into two major components separated by about 100 milliarcseconds, corresponding to sub-kiloparsec projected linear size. The observed radio structure and the large optical–radio offset suggest that J1438+6211 is a compact symmetric object, a powerful young jetted AGN whose radio emission originates from hotspots where the jet interacts with the surrounding interstellar medium.