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SUMMARY:The mass function of stars and black holes in globular clusters - 
 Mark Gieles (University of Surrey)
DTSTART:20160303T160000Z
DTEND:20160303T170000Z
UID:TALK63479@talks.cam.ac.uk
CONTACT:Simon Hodgkin
DESCRIPTION:Recent studies of early type galaxies suggest that the initial
  stellar mass function (IMF) varies with galaxy property (such as [Fe/H]).
  Globular clusters\n(GCs) formed at similar redshifts and in similar envir
 onments as galactic bulges\, and are important places to test the non-univ
 ersal IMF hypothesis. The\nvariation of the mass-to-light ratios (M/L) of 
 GCs in the Milky Way and M31 with [Fe/H] are larger than what is predicted
  by stellar population models\, and\nthis has been attributed to IMF varia
 tions. In this talk I show that the observed variations are due to biases 
 as the result of mass segregation and the data\ncan be explained by a sing
 le (I)MF. We present comparisons of new multi-component models to data of 
 several Milky Way GCs and show that the low-mass end of the (I)MF can not 
 be constrained from integrated properties. The data are more sensitive to 
 the high-mass end of the MF and this can be used to put indirect constrain
 ts on the high-mass end of the IMF via the stellar remnants and the initia
 l-final mass relation. Finally\, the presence of a stellar-mass black hole
  population leaves distinct imprints in the phase-space density of the vis
 ible stars and a possible detection of this signal in a Milky Way GC is pr
 esented.\n
LOCATION:Sackler Lecture Theatre\, IoA (tea at 3:30 pm)
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