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LOFAR Surveys: a new window on the Universe
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Fig. 4.


Top figure: example of a LoTSS-DR1 image; bottom figures: same region in NVSS (left) and FIRST (right). The black and red circles overlaid on the FIRST image show FIRST and TGSS-ADR1 sources, respectively. In this region there are 689 LoTSS-DR1 sources, 71 FIRST sources, 46 NVSS sources, and 16 TGSS-ADR1 sources. The resolution of the LoTSS-DR1 image is 6″ and the sensitivity in this region is approximately 70 μJy beam−1. This field is dominated by the spectacular galaxy NGC 4258, which in the LoTSS-DR1 image has an extent of over 3000 synthesised beams, together with the smaller edge-on spiral galaxy NGC 4217.

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