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Massive merging galaxy clusters often host diffuse Mpc-scale radiosynchrotron emission. This emission originates from relativistic electrons inthe ionized intracluster medium (ICM). An important question is how thesesynchrotron emitting relativistic electrons are accelerated. Our aim is tosearch for diffuse emission in the Frontier Fields clusters Abell S1063 andAbell 370 and characterize its properties. While these clusters are verymassive and well studied at some other wavelengths, no diffuse emission hasbeen reported for these clusters so far. We obtained 325 MHz Giant MetrewaveRadio Telescope (GMRT) and 1--4 GHz Jansky Very Large Array (VLA) observationsof Abell S1063 and Abell 370. We complement these data with Chandra andXMM-Newton X-ray observations. In our sensitive images, we discover radio halosin both clusters. In Abell S1063, a giant radio halo is found with a size of$\sim 1.2$ Mpc. The integrated spectral index between 325 MHz and 1.5 GHz is$-0.94\pm0.08$ and it steepens to $-1.77 \pm 0.20$ between 1.5 and 3.0 GHz.This spectral steepening provides support for the turbulent re-accelerationmodel for radio halo formation. Abell 370 hosts a faint radio halo mostlycentred on the southern part of this binary merging cluster, with a size of$\sim 500-700$ kpc. The spectral index between 325 MHz and 1.5 GHz is$-1.10\pm0.09$. Both radio halos follow the known scaling relation between thecluster mass proxy $Y_{500}$ and radio power, consistent with the idea thatthey are related to ongoing cluster merger events.

The discovery of radio halos in the Frontier Fields clusters Abell S1063 and Abell 370