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Radio galaxy phenomenon is directly connected to mass accreting, spinningsupermassive black holes found in the active galactic nuclei (AGN). It is stillunclear how the collimated jets of relativistic plasma on hundreds to thousandsof kpc scale form, and why nearly always they are launched from the nuclei ofbulge dominated elliptical galaxies and not flat spirals. Here we present thediscovery of giant radio source J2345-0449 (z=0.0755), a clear and extremelyrare counter example where relativistic jets are ejected from a luminous andmassive spiral galaxy on scale of ~1.6 Mpc, the largest known so far. Extremephysical properties observed for this bulgeless spiral host, such as its highoptical and infra-red luminosity, large dynamical mass, rapid disk rotation,and episodic jet activity are possibly the results of its unusual formationhistory, which has also assembled, via gas accretion from a disk, its centralblack hole of mass >2 x 10^8 M_sun. The very high mid-IR luminosity of thegalaxy suggests that it is actively forming stars and still building a massivedisk. We argue that the launch of these powerful jets is facilitated by anadvection dominated, magnetized accretion flow at low Eddington rate onto thisunusually massive (for a bulgeless disk galaxy) and possibly fast-spinningcentral black hole. Therefore, J2345-0449 is an extremely rare, unusualgalactic system whose properties challenge the standard paradigms for blackhole growth and formation of relativistic jets in disk galaxies. Thus, itprovides fundamental insight into accretion disk -- relativistic jet couplingprocesses.

Mega parsec relativistic jets launched from an accreting supermassive blackhole in an extreme spiral galaxy