Planck reveals link between active galaxies and their dark matter environment
(PHYSorg.com Space & Earth)

Scientists have used the tiny distortions imprinted on the cosmic microwave background by the gravity of matter throughout the universe, recorded by ESA`s Planck satellite, to uncover the connection between the luminosity of quasars - the bright cores of active galaxies - and the mass of the much larger `halos` of dark matter in which they sit. The result is an important confirmation for our understanding of how galaxies evolve across cosmic history.