Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-03-05
Astronomy and Astrophysics
Astrophysics
Invited talk at Alaska meeting on "Extragalactic Jets: theory and observation from radio to gamma-ray". Editors: Travis Rector
Scientific paper
I bring together evidence for the rapidity with which quasars' radio synchrotron lobe emission fades and for the intermittency with which jet plasma is ejected from individual quasars and radio galaxies and affirm the picture presented by Nipoti et al (2005) that the radio-loudness of quasars is a function of the epoch at which they are observed. I briefly illustrate this account with examples of successive episodes of jet activity where the axis along which jet plasma is launched appears to have precessed. A new model for the weak core radio emission from radio-quiet quasars, that is not any kind of jet ejecta, is also briefly described.
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