IDCS J1426.5+3508: Weak Lensing Analysis of a Massive Galaxy Cluster at
  $z=1.75$
  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 $2\sigma$ significance. Fitting a
Navarro-Frenk-White mass profile to the shear with a theoretical median
mass-concentration relation, we derive a mass
$M_{200,\mathrm{crit}}=2.3^{+2.1}_{-1.4}\times10^{14}$ M$_{\odot}$. 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.
