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Narrow-line Seyfert 1 galaxies (NLS1) are an intriguing subclass of activegalactic nuclei. Their observed properties indicate low central black hole massand high accretion rate. The extremely radio-loud NLS1 sources often showrelativistic beaming and are usually regarded as younger counterparts ofblazars. Recently, the object SDSS J110006.07+442144.3 was reported as acandidate NLS1 source. The characteristics of its dramatic optical flareindicated its jet-related origin. The spectral energy distribution of theobject was similar to that of the gamma-ray detected radio-loud NLS1, PMNJ0948+0022. Our high-resolution European Very Long Baseline InterferometryNetwork observations at 1.7 and 5 GHz revealed a compact core feature with abrightness temperature of >~ 10^(10) K. Using the lowest brightness temperaturevalue and assuming a moderate Lorentz factor of ~9 the jet viewing angle is <~26 deg. Archival Very Large Array data show a large-scale radio structure witha projected linear size of ~150 kpc reminiscent of double-sided morphology.

The radio structure of the peculiar narrow-line Seyfert 1 galaxy candidate J1100+4421