PUB - Publikationen an der Universität Bielefeld

Covering similar to 5600deg2 to rms sensitivities of similar to 70-100 Jy beam(-1), the LOFAR Two-metre Sky Survey Data Release 2 (LoTSS-DR2) provides the largest low-frequency (similar to 150 MHz) radio catalogue to date, making it an excellent tool for large-area radio cosmology studies. In this work, we use LoTSS-DR2 sources to investigate the angular two-point correlation function of galaxies within the survey. We discuss systematics in the data and an improved methodology for generating random catalogues, compared to that used for LoTSS-DR1, before presenting the angular clustering for similar to 900 000 sources >= 1.5 mJy and a peak signal-to-noise >= 7.5 across similar to 80 per cent of the observed area. Using the clustering, we infer the bias assuming two evolutionary models. When fitting angular scales of 0.5 <=<5 degrees, using a linear bias model, we find LoTSS-DR2 sources are biased tracers of the underlying matter, with a bias of C=2.14-0.20+0.22 (assuming constant bias) and E(=0)=1.79-0.14+0.15 (for an evolving model, inversely proportional to the growth factor), corresponding to E=2.81-0.22+0.24 at the median redshift of our sample, assuming the LoTSS Deep Fields redshift distribution is representative of our data. This reduces to C=2.02-0.16+0.17 and E(=0)=1.67-0.12+0.12 when allowing preferential redshift distributions from the Deep Fields to model our data. Whilst the clustering amplitude is slightly lower than LoTSS-DR1 (>= 2 mJy), our study benefits from larger samples and improved redshift estimates.