We present a comprehensive multi-wavelength analysis of the merging galaxy cluster MACS J0417.5-1154 at a redshift of z = 0.44 , using available images red obtained with Chandra in X-ray , Subaru , Hubble Space Telescope ( HST ) in optical , Giant Metrewave Radio Telescope ( GMRT ) in radio and Bolocam at 2.1 mm wavelength .
This is an example of a complex merging galaxy cluster also hosting a steep-spectrum Mpc scale radio halo .
The mass distribution obtained by weak lensing reconstruction shows that MACS J0417.5-1154 belongs to the dissociative class of mergers , where one of its substructures has had its gas content detached after the pericentric passage .
We find the main cluster mass M _ { 200 } ~ { } = ~ { } 11.5 ^ { +3.0 } _ { -3.5 } \times 10 ^ { 14 } M _ { \odot } and the smaller second ( sub ) cluster mass to be M _ { 200 } ~ { } = ~ { } 1.96 ^ { +1.60 } _ { -0.95 } \times 10 ^ { 14 } M _ { \odot } , leading to a large total mass of M _ { 200 } ~ { } = ~ { } 13.8 ^ { +2.6 } _ { -2.8 } \times 10 ^ { 14 } M _ { \odot } .
The overall structure , surface brightness profile , temperature and metal abundance of the intra-cluster medium ( ICM ) all point towards the presence of a cold front and merger induced gas-sloshing motion near the core .
We detect a surface brightness edge to the south - east direction at a projected distance of \sim 45 arcsec ( \sim 255 kpc ) from the centre of this cluster .
The X-ray spectral analysis across the inner and outer edge allows us to confirm the detected edge as a cold front .
The GMRT 235 MHz observation shows a comet - like extended sychrotron radio halo emission trailing behind the cold front .
The peak of the Sunyaev-Zel ’ dovich decrement is found displaced from the centre of X-ray emission , which is interpreted as consequence of the merger dynamics .
The optical HST imaging analysis of the cluster reveals the complex morphology of the BCG , with three surrounding ring-shaped structures with bright knots , which appear to be images of a multiply-imaged strongly lensed background galaxy .
In addition two previously unknown giant arcs are found which are all indications of strong gravitational lensing in this massive system .