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Durham University

Department of Physics

Staff profile

Publication details for Prof Richard Massey

Mo W., Gonzalez A., Jee M.J., Massey R., Rhodes J., Brodwin M., Eisenhardt P., Marrone D.P., Stanford S.A. & Zeimann G.R. (2016). IDCS J1426.5+3508: Weak Lensing Analysis of a Massive Galaxy Cluster at z = 1.75. Astrophysical Journal 818(2): L25.

Author(s) from Durham


We present a weak lensing study of the galaxy cluster IDCS J1426.5+3508 at z = 1.75, which is the highest-redshift strong lensing cluster known and the most distant cluster for which a weak lensing analysis has been undertaken. Using F160W, F814W, and F606W observations with the Hubble Space Telescope, we detect tangential shear at 2σ significance. Fitting a Navarro–Frenk–White mass profile to the shear with a theoretical median mass-concentration relation, we derive a mass ${M}{200,\mathrm{crit}}={2.3}{-1.4}^{+2.1}\times {10}^{14}\;$ M⊙. This mass is consistent with previous mass estimates from the Sunyaev–Zel'dovich (SZ) effect, X-ray, and strong lensing. The cluster lies on the local SZ–weak lensing mass scaling relation observed at low redshift, indicative of minimal evolution in this relation.