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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 themost distant cluster for which a weak lensing analysis has been undertaken.Using F160W, F814W, and F606W observations with the Hubble Space Telescope, wedetect tangential shear at $2\sigma$ significance. Fitting aNavarro-Frenk-White mass profile to the shear with a theoretical medianmass-concentration relation, we derive a mass$M_{200,\mathrm{crit}}=2.3^{+2.1}_{-1.4}\times10^{14}$ M$_{\odot}$. This massis consistent with previous mass estimates from the Sunyaev-Zel'dovich (SZ)effect, X-ray, and strong lensing. The cluster lies on the local SZ-weaklensing mass scaling relation observed at low redshift, indicative of minimalevolution in this relation.

IDCS J1426.5+3508: Weak Lensing Analysis of a Massive Galaxy Cluster at $z=1.75$