Powerful relativistic jets in spiral galaxies
  The discovery of high-energy (E>100 MeV) gamma rays from Narrow-Line Seyfert
1 Galaxies (gamma-NLS1s) has confirmed the presence of powerful relativistic
jets in this class of active galactic nuclei (AGN). Although the jet emission
is similar to that of blazars and radio galaxies, gamma-NLS1s have some
striking differences: relatively small masses (10^6-10^8 M_sun), high accretion
rates (0.1-1 times the Eddington limit) and are generally hosted by spiral
galaxies. It is now possible to study a rather unexplored range of mass and
accretion rates of AGN with relativistic jets. Specifically, in this work I
present some results obtained by comparing a sample of blazars and gamma-NLS1s
with another sample of Galactic binaries with relativistic jets (stellar mass
black holes and neutron stars).
