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

Research output: Contribution to journalArticlepeer-review

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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