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SUMMARY:Bias-Free Bispectrum Estimation for Optical Interferometry - James
  Gordon (Cavendish Astrophysics)
DTSTART:20111122T163000Z
DTEND:20111122T170000Z
UID:TALK33447@talks.cam.ac.uk
CONTACT:David Titterington
DESCRIPTION:Long-baseline optical interferometry uses the power spectrum a
 nd bispectrum constructs as fundamental observables.  Noise arising in the
  detection of the fringe pattern gives rise to both variance and biases in
  the power spectrum and bispectrum.  We show that the current generation o
 f bispectrum estimators returns biased observables\, which can significant
 ly change scientific conclusions about the target under certain observing 
 conditions.  We construct and present new estimators to be used in the red
 uction of long-baseline optical interferometry data which are bias-free in
  the presence of both photon and read noise.\n
LOCATION:Ryle Seminar Room\, Cavendish Laboratory
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