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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-2977
DTSTART:20130228T213000Z
DTEND:20130228T230000Z
DTSTAMP:20260420T004534Z
LAST-MODIFIED:20130219T144925Z
LOCATION:4421 Sterling Hall
SUMMARY:Prospects for X-ray constraints on the local super-massive bla
 ck hole occupation Fraction\, Astronomy Colloquium\, Elena Gallo\, Uni
 verstiy of Michigan
DESCRIPTION:An issue of crucial relevance in understanding the connect
 ion between super-massive black holes and their host galaxies is the "
 occupation fraction" of massive black holes in the present day univers
 e. While the occupation fraction is expected to be close to 100% in hi
 gh mass galaxies\, predictions differ dramatically at the low mass end
 \, with "light" seeds (i.e. remnants from the first generation of star
 s) producing a greater nuclear occupation fraction compared to direct 
 collapse models below a few billion solar masses. For an unbiased samp
 le\, the local active fraction represents a strong lower limit to the 
 occupation fraction\, and X-ray observations of nearby\, formally inac
 tive galaxies over a wide range in stellar masses can provide observat
 ional constraints to the very mechanism by which the first black holes
  formed. Adopting a Monte Carlo approach\, we make use of the Chandra 
 AMUSE-surveys to characterize simultaneously the black hole occupation
  fraction and the scaling of nuclear activity with host mass. Further\
 , we discuss future prospects for improving the precision of these par
 ameters as a function of sample size\, as well as desired sensitivity 
 and spatial resolution of future missions.
URL:https://www.physics.wisc.edu/events/?id=2977
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