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We represent a joint X-ray, weak-lensing, and optical analysis of theoptically-selected merging cluster, HSC J085024+001536, from the Subaru HSC-SSPsurvey. Both the member galaxy density and the weak-lensing mass map show thatthe cluster is composed of southeast and northwest components. Thetwo-dimensional weak-lensing analysis shows that the southeast component is themain cluster, and the sub- and main-cluster mass ratio is$0.32^{+0.75}_{-0.23}$. The northwest subcluster is offset by $\sim700$ kpcfrom the main cluster center, and their relative line-of-sight velocity is$\sim1300\,{\rm km s^{-1}}$ from spectroscopic redshifts of member galaxies.The X-ray emission is concentrated around the main cluster, while the gas massfraction within a sphere of $1'$ radius of the subcluster is only$f_{\mathrm{gas}}=4.0^{+2.3}_{-3.3}\%$, indicating that the subcluster gas wasstripped by ram pressure. X-ray residual image shows three arc-like excesspatterns, of which two are symmetrically located at $\sim550$ kpc from theX-ray morphological center, and the other is close to the X-ray core. Theexcess close to the subcluster has a cold-front feature where dense-cold gasand thin-hot gas contact. The two outer excesses are tangentially elongatedabout $\sim 450-650$ kpc, suggesting that the cluster is merged with a non-zeroimpact parameter. Overall features revealed by the multi-wavelength datasetsindicate that the cluster is at the second impact or later. Since theoptically-defined merger catalog is unbiased for merger boost of theintracluster medium, X-ray follow-up observations will pave the way tounderstand merger physics at various phases.

Signatures of large-scale cold fronts in the optically-selected merging cluster HSC J085024+001536