The Radio Structure of the Narrow-Line Seyfert 1 Mrk 783 with VLBA and
  e-MERLIN
  In this paper, we present the analysis of new radio and optical observations
of the narrow-line Seyfert 1 galaxy Mrk 783. 1.6 GHz observations performed
with the e-MERLIN interferometer confirm the presence of the diffuse emission
previously observed. The Very Long Baseline Array (VLBA) also detects the
nuclear source both at 1.6 GHz (L-Band) and 5 GHz (C-band). While the L-band
image shows only an unresolved core, the C-band image shows the presence of a
partially resolved structure, at a position angle of 60{\deg}. The brightness
temperature of the emission in both bands ($>10^6$ K) suggests that it is a
pc-scale jet produced by the AGN. The relatively steep VLBA spectral index
($\alpha_{VLBA} = 0.63\pm0.03$) is consistent with the presence of optically
thin emission on milliarcsecond scales. Finally, we investigated two possible
scenarios that can result in the misalignment between the kpc and pc-scale
radio structure detected in the galaxy. We also analysed the optical morphology
of the galaxy, which suggests that Mrk 783 underwent a merging in relatively
recent times.
