Top panel: evolving spectrum of electrons accelerated by a ℳ = 3.8 shock and aging in a uniform 2.0 μG magnetic field (see text for other model parameters). Middle panel: evolving radio spectra as a function of time. The top black spectrum gives the integrated spectrum for the region corresponding to the entire B1 region, while the colored lines show the spectra within different 15″ ≈ 54 kpc thick stripes perpendicular to the shock propagation axis. The additional gray symbols show the observed total integrated spectrum for B1 (top squares) and the radio halo (lower triangles), while the gray line gives the estimated contribution from the radio halo within each single 15″ stripe (assuming a flat brightness distribution). Bottom panel: color-color plot obtained by comparing the and spectral slopes within the stripes with corresponding colors, as in the central panel.
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