# A Very Large (θ E≳ 40 ″) Strong Gravitational Lens Selected with the Sunyaev-Zel’dovich Effect: PLCK G287. 0+ 32.9 (z= 0.38) Academic Article

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• Overview
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• Since galaxy clusters sit at the high end of the mass function, the number of galaxy clusters both massive and concentrated enough to yield particularly large Einstein radii poses useful constraints on cosmological and structure formation models. To date, less than a handful of clusters are known to have Einstein radii exceeding $\sim 40^{\prime\prime}$(for a source at ${z} _ {s}\simeq 2$, nominally). Here, we report an addition to that list of the Sunyaev– Zel'dovich (SZ) selected cluster, PLCK G287. 0+ 32.9 (z= 0.38), the second-highest SZ-mass (M 500) cluster from the Planck catalog. We present the first strong-lensing analysis of the cluster, identifying 20 sets of multiply imaged galaxies and candidates in new Hubble Space Telescope (HST) data, including a long, $l\sim 22^{\prime\prime}$ giant arc, as well as a quadruply imaged, apparently bright (magnified to \${J} _ {{\rm {F}} 110 {\rm {W}}}= 25.3 …