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The mosaic images, and catalogues derived from them, have significant overlap so when producing the final full-area catalogue we remove duplicate sources by only keeping those in a given mosaic if they are closest to the centre of that particular mosaic. Our final full-area catalogue consists of 4,396,228 radio sources made up of 5,121,366 Gaussian components. The overall sensitivity distribution is shown in Fig. 2 and some example maps from the data release are shown in Fig. 3.
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Fig. 2 The noise variations in the two regions covered by LoTSS-DR2 with the coverage of the 841 individual pointing outlined. The RA-13 (left) and RA-1 (right) regions span 4178 and 1457 square degrees and have median rms values of 74μJy/beam and 106μJy/beam respectively. Failed facets (white regions) are generally caused by either poor ionospheric conditions or dynamic range issues around bright sources such as 3C 48 and 3C 196. |
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