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SUMMARY:Mass Calibration of Galaxy Clusters using CMB lensing measurements
 . - Srinivasan Raghunathan (UCLA)
DTSTART:20190724T130000Z
DTEND:20190724T143000Z
UID:TALK127954@talks.cam.ac.uk
CONTACT:Steven Brereton
DESCRIPTION:Galaxy clusters are the most massive gravitationally bound obj
 ects in our Universe and are remarkable cosmological probes. Measuring the
 ir abundances as a function of mass and redshift can reveal great deal of 
 information about the parameters that influence the geometry and structure
  growth in the Universe like neutrinos and dark energy. The biases present
  in the measurement of cluster masses\, however\, limit their potential as
  cosmological probes. \n\nIn this talk\, I will discuss an unbiased method
  of estimating cluster masses using the weak-gravitational lensing of the 
 cosmic microwave background (CMB). I will then detail the recent efforts i
 n calibrating the mass-richness relation of clusters detected by the Dark 
 Energy Survey using the CMB-cluster lensing measurements from the South Po
 le Telescope. I will also explain the systematics associated in the measur
 ements and the importance of using CMB polarisation datasets in the future
 . I will finish showing the recent first detection of the polarised CMB-cl
 uster lensing signal.
LOCATION:Martin Ryle Meeting Room KICC
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