Spectacular 240 kpc double-sided relativistic jets in a spiral-hosted narrow-line Seyfert 1 galaxy

Narrow-line Seyfert 1 (NLS1) galaxies are a peculiar subclass of active galactic nuclei (AGN). They have demonstrated that the presence relativistic jets in an AGN is not strictly related to its radio-loudness, black hole mass, or host galaxy type. Here we present remarkable example radio-quiet NLS1, 6dFGS gJ035432.8-134008 (J0354-1340). In our Karl G. Jansky Very Large Array observations at 5.5 GHz source shows bright core with flat spectral index, and extended emission corresponding very elongated jets. These largest double-sided radio found date deprojected linear size almost 250 kpc. We also analysed near-infrared optical images obtained by Magellan Baade European Southern Observatory New Technology Telescope. By means photometric decomposition colour maps, determined J0354-1340 hosted spiral/disk galaxy. Fully evolved traditionally been associated high-mass elliptical hosting most massive holes, but results confirm less holes spiral can launch sustain powerful jets, implying launching governed factors other than previously believed.