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We present new 1.5-8.5 GHz Very Long Baseline Array (VLBA) observations and0.32-1.26 GHz Giant Meterwave Radio Telescope (GMRT) observations ofJ0354-1340, which is the only known radio-quiet (RQ) or radio-intermediate (RI)narrow-line Seyfert 1 galaxy with a 100-kpc two-sided radio jet. A pc-scaleone-sided jet in the southeast direction from the core emission is found in theVLBA observations, while the kpc-scale jet observed with Karl G. Jansky VeryLarge Array (VLA) and GMRT is in the south-north direction. The core spectra onpc and kpc scales are presented in combination with the archival VLASSobservations at 3.0 GHz and the VLA C configuration observations at 5.5 GHz.The pc-scale emission dominates the kpc-scale emission above ~ 5 GHz, and thespectrum is inverted due to synchrotron self-absorption. This indicates acompact synchrotron source with a size of ~ 0.04 pc, which is associated witheither the jet base or the corona. A sub-kpc scale jet, which is unresolved onscales of ~ 3 arcsec, probably dominates the emission below ~ 5 GHz. Futureradio observations can explore the jet structure between the pc and 100 kpcscales, the origin of their direction mismatch, and the pc-scale jet propermotion. It remains to be explored how common such large-scale jets are in RQ orRI AGN.

A large jet narrow-line Seyfert 1 galaxy: observations from pc to 100 kpc scales