The Ubiquitous Radio Continuum Emission from the Most Massive Early-Type
  Galaxies
  We have measured the radio continuum emission of 396 early-type galaxies
brighter than K = 9, using 1.4 GHz imagery from the NRAO VLA Sky Survey, Green
Bank 300-ft Telescope and 64-m Parkes Radio Telescope. For M_K < -24 early-type
galaxies, the distribution of radio powers at fixed absolute magnitude spans 4
orders of magnitude and the median radio power is proportional to K-band
luminosity to the power 2.78\pm0.16. The measured flux densities of M_K < -25.5
early-type galaxies are greater than zero in all cases. It is thus highly
likely that the most massive galaxies always host an active galactic nucleus or
have recently undergone star formation.
