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- W4387600519 abstract "Abstract Covering $sim 5600, deg ^2$ to rms sensitivities of ∼70 −100 μJy beam−1, the LOFAR Two-metre Sky Survey Data Release 2 (LoTSS-DR2) provides the largest low-frequency (∼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 ∼900 000 sources ≥1.5 mJy and a peak signal-to-noise ≥7.5 across ∼80 % of the observed area. Using the clustering we infer the bias assuming two evolutionary models. When fitting angular scales of $0.5 le theta <5, deg$, using a linear bias model, we find LoTSS-DR2 sources are biased tracers of the underlying matter, with a bias of $b_{C}= 2.14^{+0.22}_{-0.20}$ (assuming constant bias) and $b_{E}(z=0)= 1.79^{+0.15}_{-0.14}$ (for an evolving model, inversely proportional to the growth factor), corresponding to $b_E= 2.81^{+0.24}_{-0.22}$ at the median redshift of our sample, assuming the LoTSS Deep Fields redshift distribution is representative of our data. This reduces to $b_{C}= 2.02^{+0.17}_{-0.16}$ and $b_{E}(z=0)= 1.67^{+0.12}_{-0.12}$ 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." @default.
- W4387600519 created "2023-10-14" @default.
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- W4387600519 date "2023-10-13" @default.
- W4387600519 modified "2023-10-14" @default.
- W4387600519 title "Cosmology from LOFAR Two-metre Sky Survey Data Release 2: Angular clustering of radio sources" @default.
- W4387600519 doi "https://doi.org/10.1093/mnras/stad3088" @default.
- W4387600519 hasPublicationYear "2023" @default.
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