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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20090611T000000
DTEND;TZID=Atlantic/Canary:20090611T010000
UID:iactalks-53
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/53
CREATED:2009-06-11T00:00:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Towards a new paradigm for early-type galaxies
DESCRIPTION:Towards a new paradigm for early-type galaxies\nProf. Roger Dav
 ies\n\nThe SAURON survey has revised our view of early type galaxies disco
 vering that central disks and multiple kinematic components are common; 75
 % of the sample have extended ionized gas, often misaligned with the stars
 ; half of S0s and 25% of Es have intermediate age populations. There is a 
 tight relationship between the escape velocity and Mg line strength which 
 holds both within and between galaxies raising uncomfortable questions for
  hierarchical assembly. Many of the properties of ETGs are related to a me
 asure of their specific angular momentum : slow rotators are triaxial, clo
 se to spherical, isotropic and frequently exhibit decoupled central kinema
 tics, whereas fast rotators are intrinsically flatter, oblate, have disk-l
 ike (anisotropic) kinematics and often have Mg enhanced disks. In general 
 the slow rotators are more massive and have older populations Only half of
  the elliptical galaxies exhibit slow rotation, the remainder have stellar
  disks showing that the historic division by morphological class is physic
 ally misleading. We suggest that the contrasting physical properties of fa
 st and slow rotators arise through distinct assembly histories with slow r
 otators forming in gas free, dry mergers and fast rotators retaining a dis
 k component through a dissipative merger.
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