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The galaxy cluster Abell 1644 ($\bar{z}=0.047$) is known for its remarkablespiral-like X-ray emission. It was previously identified as a bimodal system,comprising the subclusters, A1644S and A1644N, each one centered on a giantelliptical galaxy. In this work, we present a comprehensive study of thissystem, including new weak-lensing and dynamical data and analysis plus atailor-made hydrodynamical simulation. The lensing and galaxy density mapsshowed a structure in the North that could not be seen on the X-ray images. We,therefore, rename the previously known northern halo as A1644N1 and the new oneas A1644N2. Our lensing data suggests that those have fairly similar masses:$M_{200}^{\rm N1}=0.90_{-0.85}^{+0.45} \times10^{14}$ and $M_{200}^{\rmN2}=0.76_{-0.75}^{+0.37} \times10^{14}$ M$_\odot$, whereas the southernstructure is the main one: $M_{200}^{\rm S}=1.90_{-1.28}^{+0.89}\times 10^{14}$M$_\odot$. Based on the simulations, fed by the observational data, we proposea scenario where the remarkable X-ray characteristics in the system are theresult of a collision between A1644S and A1644N2 that happened $\sim$1.6 Gyrago. Currently, those systems should be heading to a new encounter, afterreaching their maximum separation.

Revising the merger scenario of the galaxy cluster Abell 1644: a new gas poor structure discovered by weak gravitational lensing