We observed the galaxy cluster CIZA J2242.8+5301 with SRT to provide new constraints on its spectral properties at high frequency. We conducted observations in three frequency bands centred at 1.4 GHz, 6.6 GHz and 19 GHz, resulting in beam resolutions of 14′, 2.9′ and 1′ respectively. These single-dish data were also combined with archival interferometric observations at 1.4 and 1.7 GHz. Assuming simple diffusive shock acceleration, we interpret measurements of the northern relic with a continuous injection model represented by a broken power-law. Unlike other studies of the same object, no significant steepening of the relic radio emission is seen in data up to 8.35 GHz. Our results provide new insights on the magnetic structure of the relic, but further observations are needed to clarify the nature of the observed Faraday rotation.

Published in Monthly Notices of the Royal Astronomical Society, Volume 472, Issue 3, p.3605-3623