Journal Article

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 and Sunil R. Golwala

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 420, issue 2, pages 1621-1629
Published in print February 2012 | ISSN: 0035-8711
Published online January 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.20155.x
Cluster–cluster lensing and the case of Abell 383

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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 the cM relation. 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-z structures are magnified, as seen in deep Subaru observations.

Keywords: galaxies: clusters: general; galaxies: clusters: individual: Abell 383; cosmology: observations; dark matter

Journal Article.  6973 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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