  In the hierarchical structure formation model, galaxies grow through various
merging events. Numerical simulations indicate that the mergers can enhance the
activity of the central supermassive black holes in the galaxies. Pfeifle et
al. (2019a) identified a system of three interacting galaxies, J0849$+$1114,
and provided multiwavelength evidence of all three galaxies containing active
galactic nuclei. The system has substantial radio emission, and with
high-resolution radio interferometric observation we aimed to investigate its
origin, whether it is related to star formation or to one or more of the active
galactic nuclei in the system. We performed high-resolution continuum
observation of J0849$+$1114 with the European Very Long Baseline Interferometry
Network at $1.7$ GHz. We detected one compact radio emitting source at the
position of the easternmost nucleus. Its high brightness temperature and radio
power indicate that the radio emission originates from a radio-emitting active
galactic nucleus. Additionally, we found that significant amount of flux
density is contained in $\sim 100$ milliarcsec-scale feature related to the
active nucleus.
