Lorentz Center - Powerful Radio Galaxies: Triggering and Feedback from 23 Nov 2009 through 27 Nov 2009
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    Powerful Radio Galaxies: Triggering and Feedback
    from 23 Nov 2009 through 27 Nov 2009

 
Proposal for a workshop at the Lorentz Centre

Organisers: Raffaella Morganti (ASTRON), Clive Tadhunter (Sheffield), Philip Best (Edinburgh), Joanna Holt (Leiden), Martin Hardcastle (Herts), Nicole Nesvadba (Paris)

 

There is increasing speculation that powerful AGN activity may be intimately linked to the overall galaxy evolution process, both via the gas accretion events that trigger the activity, and via the feedback effects of the AGN-driven outflows.  However, there remain considerable uncertainties about the exact nature of the links between the evolution of AGN and their host galaxies. Radio galaxies are particularly important in this regard because they drive powerful jets and are invariably associated with early-type host galaxies. Over the last few years a wealth of data has been gathered for radio galaxies using HST, Chandra, Spitzer, and various radio and 8m class optical telescopes. In the near future our ability to detect and observe such objects will be vastly improved with the introduction of a new generation of radio, sub-mm, infrared and optical facilities. Therefore, the aim of the workshop was to review the latest results and takes a holistic approach to this important subset of AGN.

 

The following issues were addressed in the workshop.

 

  • What are the dominant modes of triggering of powerful radio galaxies?
  • How do the triggering modes, local ISM and host galaxy properties relate to the AGN and jet properties?
  • To what extent can the luminosity functions and evolution of the radio source populations be reconciled with the evolution of galaxies in general?
  • How can we deduce the kinetic powers of the relativistic jets using radio and X-ray observations?
  • How significant are the warm and cool gas outflows driven by the jets and AGN?

 

The workshop attracted 62 participants from around the world, with a good mix of PhD students (23%), young postdocs (34%), and permanent academics (43%). The workshop included 19 invited review talks (30+5mins), 21 contributed talks (20+5mins),  and 6 shorter (5min) talks. As well as the 5 minutes allowed at the end of each longer talk, discussion was facilitated by the plenary discussion sessions at the end of each day (~30 – 45min), intended to cover “open questions” collected by the session chairs and raised by participants, and the extended 2hr lunch breaks, which incorporated 1hr for informal discussion; much discussion also took place in bar of the Bastion hotel at the end of each day!

 

Despite the relatively packed programme, the workshop worked well, with plenty of lively discussion and interaction. This was aided by the excellent facilities and organisation of the Lorentz Center, the timeslots specifically set aside in the programme for discussion, and the fact that the speakers kept to their allotted times, allowing valuable discussion at the end of each of the longer talks. The broad programme also succeeded in bringing together observers and theorists, as well as astronomers working in a wide range of wavelength regions.

 

Although successful, the workshop would have been improved by having a free afternoon (on the Wednesday) and a session specifically set aside to advertise posters.

 

Clive Tadhunter & Raffaella Morganti 14/12/09



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