  It is believed that dual active galactic nuclei (dual AGN) will form during
galaxies merge. Studying dual-AGN emission can provide valuable insights into
galaxy merging and evolution. To investigate parsec-scale radio emission
properties, we observed eight radio components of four selected dual-AGN
systems using the Very Long Baseline Array (VLBA) at 5 GHz in
multiple-phase-center mode. Among them, two compact radio components, labeled
J0051+0020B and J2300-0005A, were detected clearly on parsec scales for the
first time. However, the radio emission of the other six components was
resolved out in the high-resolution images. We provided the values or upper
limits of the brightness temperature and radio emission power, and analyzed the
emission origins in detail for each target. Based on their physical properties
reported in this work and in the literature, we suggest the radio emission in
J0051+0020B and J2300-0005A originates primarily from compact jets, while the
other six sources show more complex emission mechanisms. In addition, our VLBA
observations suggest the systematic X-ray deficit in our dual-AGN sample is
likely attributed to the tidally induced effect and possible viewing angle
effect.
