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SUMMARY:Measurement of the dipole in the cross-correlation function of gal
 axies - Camille Bonvin (CERN)
DTSTART:20151116T130000Z
DTEND:20151116T140000Z
UID:TALK62320@talks.cam.ac.uk
CONTACT:Daisy Mak
DESCRIPTION:It is usually assumed that in the linear regime the two-point 
 correlation function of galaxies contains only a monopole\, quadrupole and
  hexadecapole. Looking at cross-correlations between different populations
  of galaxies\, this turns out not to be the case. In particular\, the cros
 s-correlations between a bright and a faint population of galaxies contain
  also a dipole. In this talk I will discuss the different types of effects
  that contribute to the dipole: relativistic effects\, evolution effects a
 nd wide-angle effects. I will construct an optimal estimator to measure th
 e dipole with multiple populations of galaxies. I will then present the fi
 rst measurement of this dipole in the BOSS survey. I will show that the re
 lativistic and evolution dipole are too small to be detected in this sampl
 e. However with the appropriate choice of kernel\, the wide-angle effect c
 an be significantly enhanced and measured with a signal-to-noise of 30.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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