Fig. 1
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LoTSS DR2 images in Stokes I for nine example pulsars. All images have a field-of-view of 90″ × 90″, except for panel a which has 8′ × 8′ and panel b which has 2.′5 × 2.′5. Positions of LoTSS sources are indicated with a black square, while positions from the pulsar catalogue are denoted with the red cross. The extent of LoTSS sources is shown with the black dashed ellipses, depicting the major- and minor axes resulting from fitting to the LoTSS sources (Shimwell et al. 2022). The FWHM of the LoTSS beam is shown in the bottom-right corners. Flux density contours in mJy beam−1 are plotted for panel i to highlight the structure within bright sources. Panels d and g show example pulsars with accurate position measurements, leading to a unique match to a LoTSS source, while panel a shows an example where the positional uncertainty of the pulsar is large and several LoTSS sources coincide with the 99% confidence error region (denoted by the red dotted ellipse). In panel b, a field of LoTSS sources are shown, where the northern-most source is matched to a pulsar. All visible components show source extension to the east, indicating an imaging problem. Pulsar J1336+3414 is dimly visible as a point source in panel e, and due to its low brightness and/or the proximity of the eastern bright source it is a ~4σ detection that is not catalogued in LoTSS DR2. We estimate its flux density directly from the image. Panel c shows a pulsar with a separation of 8.″4 to a LoTSS source, but does not contain it within its 99% uncertainty ellipse. In panel f, a pulsar is matched to a LoTSS source that was classified as a single extended object, while it in fact consists of two unrelated objects, one of which is the pulsar counterpart. Finally, panel i shows a compact radio source that is present at the position of PSR B1112+50, but due to the proximity of a brighter radio source, it is catalogued in LoTSS as an extended source with an offset position.
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