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Redshifted 21 cm signal from neutral hydrogen is one of the most competitiveprobes of the epoch of reionization (EoR). Unpolarized 21 cm radiation acquiresa certain level of linear polarization during the EoR due to Thompsonscattering. This linear polarization, if measured, could probe importantinformation about the EoR. We study the effect of Galactic Faraday rotation(FR) in the detection of polarization of 21 cm radiation. Since the effect ofFR is strong due to the large wavelength nature of redshifted 21 cm signal, theinitial E-mode signal carried by 21 cm photons is modified in its entirety. Weshow that a 99 % accuracy on rotation measure (RM) data is necessary to recoverthe initial E-mode signal. We conclude that, given the current status of RMobservations, it is not possible to retrieve the initial polarization signal of21 cm from the EoR. However, we are optimistic that it may be possible from thenext generation radio surveys.

Galactic Faraday rotation effect on polarization of 21 cm lines from the epoch of reionization