Cluster-cluster lensing and the case of Abell 383

Adi Zitrin*, Yoel Rephaeli, Sharon Sadeh, Elinor Medezinski, Keiichi Umetsu, Jack Sayers, Mario Nonino, Andrea Morandi, Alberto Molino, Nicole Czakon, Sunil R. Golwala

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Extensive surveys of galaxy clusters motivate us to assess the likelihood of cluster-cluster lensing (CCL), namely, gravitational lensing of a background cluster by a foreground cluster. We briefly describe the characteristics of CCLs in optical, X-ray and Sunyaev-Zel'dovich effect measurements, and calculate their predicted numbers for Λ cold dark matter (ΛCDM) parameters and a viable range of cluster mass functions and their uncertainties. The predicted number of CCLs in the strong-lensing regime varies from several (<10) to as high as a few dozen, depending mainly on whether lensing triaxiality bias is accounted for, through thec-Mrelation. A much larger number is predicted when taking into account also CCL in the weak-lensing regime. In addition to few previously suggested CCLs, we report a detection of a possible CCL in A383, where background candidate high-zstructures are magnified, as seen in deep Subaru observations.

Original languageEnglish
Pages (from-to)1621-1629
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Volume420
Issue number2
DOIs
StatePublished - Feb 2012

Keywords

  • Cosmology: observations
  • Dark matter
  • Galaxies: clusters: general
  • Galaxies: clusters: individual: Abell 383

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