What are called radio galaxies? Give examples of radio galaxies. What is their radio emission power?

What are called radio galaxies? Give examples of radio galaxies. What is their radio emission power? Compare with the energy of a supernova

Galaxies with active nuclei, with active powerful radio sources. Often, cosmic ray fluxes are observed from the nucleus of such galaxies, most often in opposite directions. Moving away from the center of the galaxy, the electrons of the cosmic rays generate powerful synchrotron radio emission. The closest radio galaxy to us is Centaurus A, (NGC 5128) distance R = 4.4 kpc. The power of the radio emission from the radio galaxy in the constellation Virgo is 1035 W, which is a hundred thousand times more than our Galaxy. The nearest radio galaxy to us is Centaurus A.

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