We present the discovery of ringlike diffuse radio emission structures in the peripheral regions of the Bullet cluster 1E 0657 - 55.8 .
Ring formations are spanning between 1–3 Mpc away from the center of the cluster , significantly further away from the two already reported relics .
Integrated fluxes of four of the sub-regions in the inner ‘ ring ’ from 4.5 to 10 GHz have also been reported .
To understand the possible origin of these structures , here we present a maiden attempt of numerical modelling of a 3D and realistic ‘ bullet ’ like event in a full cosmological ( \Lambda CDM ) environment with N-body plus hydrodynamics code .
We report a simulated ‘ bullet ’ found inside a ( 128 Mpc ) ^ { 3 } volume simulation with a speed of 2700 km s ^ { -1 } , creating a high supersonic bow shock of Mach M = 3.5 and a clear evidence of temporal separation of dark matter and baryons , assuring no challenge to \Lambda CDM cosmology from the bullet event as of now .
We are also able to unveil the physics behind the formation of these observed multiple shock structures .
Modelled radio emissions in our simulation support a complex combination of merger-associated processes that accelerates and re-accelerates fossil and cosmic-ray electrons .
With a time evolution study and the computed radio emissions , we have shown that the ring like formation around the bullet is originated due to the interaction of the strong merger shocks with the accretion shocks at the periphery .
The multiple shock structures observed are possibly originated from multiple mergers that have taken place at different times and much before the bullet event .