X-ray study of the double source plane gravitational lens system Eye of Horus observed with XMM-Newton

Keigo Tanaka, Ayumi Tsuji, Hiroki Akamatsu, J. H.H. Chan, Jean Coupon, Eiichi Egami, Francois Finet, Ryuichi Fujimoto, Yuto Ichinohe, Anton T. Jaelani, Chien Hsiu Lee, Ikuyuki Mitsuishi, Anupreeta More, Surhud More, Masamune Oguri, Nobuhiro Okabe, Naomi Ota, Cristian E. Rusu, Alessandro Sonnenfeld, Masayuki TanakaShutaro Ueda, Kenneth C. Wong

Research output: Contribution to journalArticlepeer-review


A double source plane (DSP) system is a precious probe for the density profile of distant galaxies and cosmological parameters. However, these measurements could be affected by the surrounding environment of the lens galaxy. Thus, it is important to evaluate the cluster-scale mass for detailed mass modelling. We observed the Eye of Horus, a DSP system discovered by the Hyper Suprime-Cam Subaru Strategic Survey (HSC-SSP), with XMM-Newton. We detected two X-ray extended emissions, originating from two clusters, one centred at the Eye of Horus, and the other located ~100 arcsec north-east to the Eye of Horus.We determined the dynamical mass assuming hydrostatic equilibrium, and evaluated their contributions to the lens mass interior of the Einstein radius. The contribution of the former cluster is 1.1+1.2-0.5 × 1012M, which is 21-76 per cent of the total mass within the Einstein radius. The discrepancy is likely due to the complex gravitational structure along the line of sight. On the other hand, the contribution of the latter cluster is only ~ 2 per cent on the Eye of Horus. Therefore, the influence associated with this cluster can be ignored.

Original languageEnglish (US)
Pages (from-to)3411-3418
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
StatePublished - Jan 2020


  • Clusters
  • Clusters
  • Gravitational lensing
  • HSC J142449- 005322 - galaxies
  • Individual
  • Intracluster medium
  • Strong-Galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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