Daily Image
01-03-2018
Today's colloquium - Radio galaxies: Models and Reality
| Submitter: | Martin Hardcastle |
| Description: | Radio galaxies and other 'radio-loud' AGN are widely thought to be the main mechanism providing the 'feedback' that prevents catastrophic cooling and hence limits the growth of the most luminous galaxies in the universe. But such models are based on very simplistic pictures of how radio-loud AGN work and it is very difficult to test even whether they are energetically viable. I will discuss ongoing efforts to understand the physical conditions in radio galaxies and to use that information to construct numerical and analytical models. Such models will be used to interpret large-area surveys being carried out now, with the best example being the LOFAR-LoTSS survey, and I'll discuss the process of deriving large-volume AGN samples from those data. Left image shows a numerical model of a powerful FRII radio galaxy by English et al 2016. Right image is the combined Chandra/HST/VLA view of Cygnus A. |
| Copyright: | Public |
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