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SUMMARY:Star clusters and galaxies\, a common origin? - Mark Gieles (IoA)
DTSTART:20100303T131500Z
DTEND:20100303T134500Z
UID:TALK23572@talks.cam.ac.uk
CONTACT:Dr Jonathan Gair
DESCRIPTION:Over several orders of magnitude in mass\, both young and old 
 (globular) clusters have radii of a couple of parsecs. This remarkable fea
 ture has several intriguing implications\, the most obvious being that mas
 sive clusters are denser than low mass clusters.\n\nObjects above a few ti
 mes 10^6 Msun\, referred to as "massive star clusters"\, "ultra-compact dw
 arf galaxies" or "dwarf-globular transition objects"\, appear to have a po
 sitive correlation between radius and mass\, in agreement with the extensi
 on of the relation for elliptical galaxies.\n\nCombining relations for ste
 llar lifetimes and dynamical evolution of clusters\, it is shown that any 
 mass-radius relation that might exist at birth is quickly erased by the ex
 pansion due to stellar evolution. At an age of a Hubble time all memory of
  initial conditions is erased since most star clusters are evolving self-s
 imilarly. The implication of this self-similar evolution for the mass-radi
 us relation of stellar systems in general\, and the distinction between st
 ar clusters and galaxies in particular\, is discussed.\n
LOCATION:Sackler Lecture Theatre\, IoA
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