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SUMMARY:AGN Space Densities and the FR Dichotomy - Melanie Gendre (Jodrell
  Bank Centre for Astrophysics\, Manchester)
DTSTART:20111018T153000Z
DTEND:20111018T163000Z
UID:TALK33442@talks.cam.ac.uk
CONTACT:David Titterington
DESCRIPTION:Extended double-lobe radio sources can be morphologically clas
 sified into two groups:  Fanaroff-Riley (FR) type I sources have the highe
 st surface brightness along the jets near the core and FR type II sources 
 show the highest surface brightness at the lobe extremities\, as well as m
 ore collimated jets.  This work focuses on a comparison of the space densi
 ties of FRI and FRII sources at different epochs\, with a particular focus
  on FRI sources.  The Combined NVSS-FIRST Galaxy catalogue (CoNFIG)\, a sa
 mple of radio sources at 1.4 GHz\, includes VLA observations\, FRI/FRII mo
 rphology classifications\, optical identifications and redshift estimates.
   The final catalogue consists of 858 sources over 4 samples (CoNFIG-1\,2\
 ,3 and 4 with flux density limits of S_1.4GHz = 1.3\,0.8\,0.2 and 0.05 Jy 
 respectively).  It is 95.7% complete in radio morphology classification an
 d 74.3% of the sources have redshift data.  Combining CoNFIG with compleme
 ntary samples\, the distribution and cosmic evolution of FRI and FRII sour
 ces are investigated.  It is found that FRI sources undergo mild evolution
  and that\, at the same radio luminosity\, FRI and FRII sources show simil
 ar space density enhancements in various redshift ranges\, implying a comm
 on mechanism powering the luminosity-dependent evolution.  This improved u
 nderstanding of radio galaxy evolution will also give better insight into 
 the physics of AGN and their role in galaxy formation.
LOCATION:Martin Ryle Seminar Room\, Kavli Building
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