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We conducted Very Long Baseline Array (VLBA) observations of seven nearbynarrow-line Seyfert 1 (NLS1) galaxies at 1.7 GHz (18cm) with milli-arcsecondresolution. This is the first systematic very long baseline interferometry(VLBI) study focusing on the central parsec-scale regions of radio-quiet NLS1s.Five of the seven were detected at a brightness temperature of >~5x10^6 K andcontain radio cores with high brightness temperatures of >6x10^7 K, indicatinga nonthermal process driven by jet-producing central engines as is observed inradio-loud NLS1s and other active galactic nucleus (AGN) classes. VLBA imagesof MRK 1239, MRK 705, and MRK 766 exhibit parsec-scale jets with clear linearstructures. A large portion of the radio power comes from diffuse emissioncomponents that are distributed within the nuclear regions (<~300 pc), which isa common characteristic throughout the observed NLS1s. Jet kinetic powerslimited by the Eddington limit may be insufficient to allow the jets escape tokiloparsec scales for these radio-quiet NLS1s with low-mass black holes of<~10^7 M_sun.

Very Long Baseline Array Imaging of Parsec-scale Radio Emissions in Nearby Radio-quiet Narrow-line Seyfert 1 Galaxies