The overwhelming foreground contamination is one of the primary impediments to probing the Epoch of Reionization ( EoR ) through measuring the redshifted 21 cm signal .
Among various foreground components , radio halos are less studied and their impacts on the EoR observations are still poorly understood .
In this work , we employ the Press–Schechter formalism , merger-induced turbulent reacceleration model , and the latest SKA1-Low layout configuration to simulate the SKA \enquote observed images of radio halos .
We calculate the one-dimensional power spectra from simulated images and find that radio halos can be about \numlist e4 ; e3 ; e2.5 times more luminous than the EoR signal on scales of \SI { 0.1 } { \per \Mpc } < k < \SI { 2 } { \per \Mpc } in the \numrange 120128 , \numrange 154162 , and \numrange 192200 \si \MHz bands , respectively .
By examining the two-dimensional power spectra inside properly defined EoR windows , we find that the power leaked by radio halos can still be significant , as the power ratios of radio halos to the EoR signal on scales of \SI { 0.5 } { \per \Mpc } \lesssim k \lesssim \SI { 1 } { \per \Mpc } can be up to about \numrange 230800 % , \numrange 1895 % , and \numrange 740 % in the three bands when the 68 % uncertainties caused by the variation of the number density of bright radio halos are considered .
Furthermore , we find that radio halos located inside the far side lobes of the station beam can also impose strong contamination within the EoR window .
In conclusion , we argue that radio halos are severe foreground sources and need serious treatments in future EoR experiments .