A weak lensing detection of the cosmological distance-redshift relation behind three massive clusters

Elinor Medezinski*, Tom Broadhurst, Keiichi Umetsu, Narciso Benítez, Andy Taylor

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The amplitude of weak lensing should increase with source distance, rising steeply behind a lens and saturating at high redshift, providing a model-independent means of measuring cosmic geometry. We measure the amplitude of weak lensing with redshift for three massive clusters, A370 (z= 0.375), ZwCl0024+17 (z= 0.395) and RXJ1347-11 (z= 0.451), using deep, three-colour Subaru imaging. We define the depth of lensed populations with reference to the COSMOS and GOODS fields, providing a consistency check of photo-z estimates over a wide range of redshift and magnitude. The predicted distance-redshift relation is followed well for the deepest data set, A370, for a wide range of cosmologies, and is consistent with less accurate data for the other two clusters. Scaling this result to a new survey of ~25 massive clusters should provide a useful cosmological constraint on w, complementing existing techniques, with distance measurements covering the untested redshift range, 1 < z < 5.

Original languageEnglish
Pages (from-to)1840-1850
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Volume414
Issue number3
Early online date21 Jun 2011
DOIs
Publication statusPublished - 1 Jul 2011

Keywords

  • Cosmology: observations
  • Galaxies: clusters: individual: Abell 370
  • Galaxies: clusters: individual: RX J1347.5-1145
  • Galaxies: clusters: individual: ZwCl 0024.0+1652
  • Gravitational lensing: weak

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