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SUMMARY:Cold gas outflows and lifecycle of radio galaxies *** Seminar canc
 elled *** - Raffaella Morganti (ASTRON)
DTSTART:20150203T163000Z
DTEND:20150203T173000Z
UID:TALK56990@talks.cam.ac.uk
CONTACT:David Titterington
DESCRIPTION:The energy released by an active galactic nucleus (AGN) has a 
 strong impact on the surrounding interstellar medium (ISM).  The important
  role for galaxy evolution of these energetic feedback effects has been su
 pported\, in recent years\, by the discovery of massive gas outflows in a 
 growing number of galaxies with AGN.  Even more interesting has been the r
 ealisation that the dominant component of these AGN-driven outflows appear
 s to be associated with cold (atomic and/or molecular) gas.\n   I will pre
 sent recent results obtained from HI and CO observations of a number of ob
 jects where the radio jet is playing a major role in producing large and f
 ast gas outflows.  The results are reinforcing the conclusion that gas out
 flows have a complex and multiphase structure and that cold gas in differe
 nt phases (atomic and molecular) represents a major component.  High-spati
 al resolution observations have allowed\, in a number of sources\, to loca
 te the region where the outflow originates as well as to derive more accur
 ate estimates of the mass outflow rate and the associated energy.  Therefo
 re\, these results provide important constraints for understanding the mec
 hanisms that lie at the origin out the outflows.\n   A possible link betwe
 en the evolutionary stage of the radio source and the presence of cold gas
  and outflows will also be discussed.  This is explored using observations
  at low frequency (LOFAR)\, to trace past phases of activity combined with
  HI observations.  The latter are part of a campaign of preparatory work f
 or Apertif\, the phased array feeds system upgrade of the Westerbork radio
  telescope.  I will give an update on the results obtained so far.\n
LOCATION:Venue to be confirmed
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