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A dissociative merger is formed by the interplay of ram pressure andgravitational forces, which can lead to a spatial displacement of the darkmatter and baryonic components of the recently collided subclusters. CIZAJ0107.7+5408 is a nearby (z=0.105) dissociative merger that hosts two X-raybrightness peaks and a bimodal galaxy distribution. Analyzing MMT/Hectospecobservations, we investigate the line-of-sight and spatial distribution ofcluster galaxies. Utilizing deep, high-resolution Hubble Space TelescopeAdvanced Camera for Surveys imaging and large field-of-view SubaruHyper-Suprime-Cam observations, we perform a weak-lensing analysis of CIZAJ0107.7+5408. Our weak-lensing analysis detects a bimodal mass distributionthat is spatially consistent with the cluster galaxies but significantly offsetfrom the X-ray brightness peaks. Fitting two NFW halos to the lensing signal,we find an equal-mass merger with subcluster masses of$M_{200,NE}=2.8^{+1.1}_{-1.1}\times10^{14}$ M$_\odot$ and$M_{200,SW}=3.1^{+1.2}_{-1.2}\times10^{14}$ M$_\odot$. Moreover, themass-to-light ratios of the subclusters, $(M/L)_{NE}=571^{+89}_{-91}$$M_\odot/L_{\odot,B}$ and $(M/L)_{SW}=564^{+87}_{-89}$ $M_\odot/L_{\odot,B}$,are found to be consistent with each other and within the range ofmass-to-light ratios found for galaxy clusters.

HST and HSC Weak-lensing Study of the Equal-mass Dissociative Merger CIZA J0107.7+5408