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SUMMARY:A physical basis for the timing properties of X-ray binaries - Ada
 m Ingram\, University of Durham
DTSTART:20090916T134500Z
DTEND:20090916T140000Z
UID:TALK19874@talks.cam.ac.uk
CONTACT:Alexander Blustin
DESCRIPTION:The low frequency Quasi Periodic Oscillation has been known in
  black hole binaries and neutron stars for over 20 years but there is stil
 l no consensus in the literature as to its physical origin. I show how thi
 s can be naturally interpreted in the context of the truncated disc/hot in
 ner flow models designed to explain the spectral evolution. Lense-Thirring
  (vertical) precession of the hot inner flow can explain the QPO frequenci
 es and their observed correlation with spectral softness. It also explains
  the why the QPO spectrum is hard as the modulation is of the Comptonised 
 emission from the hot flow rather than the thin disc. I then show how this
  model can be tested in atoll sources and extended to produce the broad ba
 nd continuum noise from MRI fluctuations in the hot flow. This gives the f
 irst complete model for the power spectral components seen in black hole b
 inaries and neutron stars. 
LOCATION:Sackler Lecture Theatre\, IoA
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