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This article has an erratum: [https://doi.org/10.1051/0004-6361/201628702e]


Fig. 7

image

Measured and modelled spectra of the eastern (black) and western (red) nuclei. Surface brightness measurements (Table 3) are plotted as stars. The thick line segments going through the 150 MHz measurements illustrate the measured LOFAR in-band spectral index at the GHz positions of the nuclei, see also Fig. 4a. The solid lines show the surface brightness at 33 GHz positions of the two nuclei, as predicted by the three component model described in Sect. 4. The dashed lines show the spectra of the nuclei without any extended component, i.e. only the exponential disks described in Sect. 4.1 following Eq. (4). The thin black vertical line indicates the frequency 60 MHz where future observations with the International LOFAR Low Band Array could be used to obtain resolution images.

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