Fig. 8.


Residual RA and Dec offsets for LOFAR detected sources matched with their Pan-STARRS counterparts. The histograms show the number of sources at various RA and Dec offsets and the ellipse shows the peak location (less than 0.02″ from the centre in both RA and Dec) and the FWFM (σ ≈ 0.2″) of the Gaussian functions that are fitted to the histograms of the offsets. Similar plots showing the same LoTSS-DR1 sources cross-matched with WISE or FIRST sources show comparable systematic offsets and standard deviations of less than 0.27″ and 0.3″, respectively.

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