Abstract
the LOw Frequency ARray (LOFAR) is a radio interferometer which consists of 52 stations distributed in Europe. The Netherlands host 24 core and 14 remote stations operating at the shortest baselines. The remaining 14 stations are located in other countries and provide the longest baselines. Each single station consists of a set of low-band and high-band antennas observing in the 30-80 and 110-240 frequency ranges, respectively. <P />We used the radio continuum 120-168MHz images (central frequency of 144MHz) of planetary nebulae (PNe) collected by the LOFAR Two-Metre Sky Survey (LoTSS; Shimwell+ 2019, J/A+A/622/A1). The survey uses only the data from core and remote stations. The survey provides low- and high-resolution images with the full width at half maximum of the restoring beam being 20 and 6", respectively. The median positional accuracy of the high-resolution images is 0.2", though it may range from 0.1" to 4.8" for individual fields. <P />The LoTSS observations and data processing are still ongoing. We included observations which were processed before 2021 April. This largely overlapped with the upcoming LoTSS-DR2 (Shimwell+ 2022, J/A+A/659/A1). See Section 3. <P />We selected 165 PNe in the observed part of sky using the SIMBAD database and the catalog by Parker+ (2016JPhCS.728c2008P). Out of them, 30 were detected (see Table 1). <P />(2 data files).
