Eye of Sauron

This is cool. A research team discovered that a blazar's jet cone is pointed almost directly at us--we can see inside. The image above is their calculation of the magnetic field direction based on the polarization of light. Different regions along the jet are thought responsible for producing all manner of radiation, from radio waves to neutrinos. When such an energetic (Doppler shift of 30?) beam strikes gas clouds, the collisions produce new particles (e.g. pions), which when they decay produce neutrinos--which IceCube has detected coming from this blazar.