Measurement of the dipole in the cross-correlation function of galaxies

Add to your list(s) Download to your calendar using vCal

• Camille Bonvin (CERN)
• Monday 16 November 2015, 13:00-14:00
• CMS, Pav. B, CTC Common Room (B1.19) [Potter Room].

If you have a question about this talk, please contact Daisy Mak.

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 cross-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 and wide-angle effects. I will construct an optimal estimator to measure the dipole with multiple populations of galaxies. I will then present the first measurement of this dipole in the BOSS survey. I will show that the relativistic and evolution dipole are too small to be detected in this sample. However with the appropriate choice of kernel, the wide-angle effect can be significantly enhanced and measured with a signal-to-noise of 30.

This talk is part of the Cosmology Lunch series.

This talk is included in these lists:

• All CMS events
• CMS Events
• CMS, Pav. B, CTC Common Room (B1.19) [Potter Room]
• Cambridge Astronomy Talks
• Cosmology Lunch
• Cosmology lists
• Cosmology, Astrophysics and General Relativity
• DAMTP info aggregator
• Interested Talks
• Kavli Institute for Cosmology Talk Lists
• Priscilla
• bld31

Note that ex-directory lists are not shown.