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Fig. 2.

image

Images from uGMRT of the galaxy cluster MACS J0717+3745. Images show the chair-shaped relic and filamentary structures also reported at high frequency (van Weeren et al. 2017a). The image demonstrates that the northern part of the relic is composed of multiple filaments (shown with red arrows). Left: combined uGMRT band 3 (300−500 MHz) and band 4 (550−850 MHz) image created using Briggs weighting and robust = 0. The image has a beam size of 8″ × 4″ and noise level of σrms = 13 μJy beam−1. Right: high-resolution uGMRT band 4 image obtained using Uniform weighting, which has a beam size of 3.5″ × 3.5″. The noise level is σrms = 28 μJy beam−1. The beam shape is indicated in the bottom left corner of each image.

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