Lensing and time-delay contributions to galaxy correlations

Alvise Raccanelli, Daniele Bertacca, Roy Maartens, Chris Clarkson, Olivier Doré

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Galaxy clustering on very large scales can be probed via the 2-point correlation function in the general case of wide and deep separations, including all the lightcone and relativistic effects. Using our recently developed formalism, we analyze the behavior of the local and integrated contributions and how these depend on redshift range, linear and angular separations and luminosity function. Relativistic corrections to the local part of the correlation can be non-negligible but they remain generally sub-dominant. On the other hand, the additional correlations arising from lensing convergence and time-delay effects can become very important and even dominate the observed total correlation function. We investigate different configurations formed by the observer and the pair of galaxies, and we find that the case of near-radial large-scale separations is where these effects will be the most important.
Original languageEnglish
Article number84
JournalGeneral Relativity and Gravitation
Early online date2 Jun 2016
Publication statusPublished - 1 Jul 2016


  • astro-ph.CO
  • galaxy clustering
  • correlation function
  • relativistic effects
  • RCUK
  • STFC
  • ST/H002774/1


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