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SUMMARY:Cold gas outflows and lifecycle of radio galaxies - Raffaella Morg
 anti  (ASTRON)
DTSTART:20150303T163000Z
DTEND:20150303T173000Z
UID:TALK57894@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 importa
 nt role for galaxy evolution of these energetic feedback effects has been 
 supported\, in recent years\, by the discovery of massive gas outflows in 
 a growing number of galaxies with AGN.  Even more interesting has been the
  realisation that the dominant component of these AGN-driven outflows appe
 ars to be associated with cold (atomic and/or molecular) gas.\n   I will p
 resent recent results obtained from HI and CO observations of a number of 
 objects where the radio jet is playing a major role in producing large and
  fast gas outflows.  The results are reinforcing the conclusion that gas o
 utflows have a complex and multiphase structure and that cold gas in diffe
 rent phases (atomic and molecular) represents a major component.  High-spa
 tial resolution observations have allowed\, in a number of sources\, to lo
 cate the region where the outflow originates as well as to derive more acc
 urate estimates of the mass outflow rate and the associated energy.  There
 fore\, these results provide important constraints for understanding the m
 echanisms that lie at the origin out the outflows.\n   A possible link bet
 ween the evolutionary stage of the radio source and the presence of cold g
 as and outflows will also be discussed.  This is explored using observatio
 ns at low frequency (LOFAR)\, to trace past phases of activity combined wi
 th HI observations.  The latter are part of a campaign of preparatory work
  for Apertif\, the phased array feeds system upgrade of the Westerbork rad
 io telescope.  I will give an update on the results obtained so far.\n
LOCATION:Martin Ryle Seminar Room\, Kavli Institute
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