Cosmology from LOFAR Two-metre Sky Survey Data Release 2: angular clustering of radio sources
Monthly Notices of the Royal Astronomical Society, vol. 527, pp. 6540–6568
Abstract
ABSTRACT Covering $\sim 5600\, \deg ^2$ to rms sensitivities of ∼70−100 $\mu$Jy 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 per cent of the observed area. Using the clustering, we infer the bias assuming two evolutionary models. When fitting angular scales of $0.5 \le \theta \lt 5{^\circ }$, using a linear bias model, we find LoTSS-DR2 sources are biased tracers of the underlying matter, with a bias of $b_{\rm C}= 2.14^{+0.22}_{-0.20}$ (assuming constant bias) and $b_{\rm E}(z=0)= 1.79^{+0.15}_{-0.14}$ (for an evolving model, inversely proportional to the growth factor), corresponding to $b_{\rm E}= 2.81^{+0.24}_{-0.22}$ at the median redshift of our sample, assuming the LoTSS Deep Fields redshift distribution is representative of our data. This reduces to $b_{\rm C}= 2.02^{+0.17}_{-0.16}$ and $b_{\rm E}(z=0)= 1.67^{+0.12}_{-0.12}$ 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.
Authors 18
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Catherine Laura Hale corresponding
Royal Observatory · University of Edinburgh
Affiliation as printed
Institute for Astronomy, School of Physics and Astronomy, University of Edinburgh, Royal Observatory Edinburgh , Blackford Hill, Edinburgh EH9 3HJ , UK
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Affiliation as printed
Fakultät für Physik, Universität Bielefeld , Postfach 100131, D-33501 Bielefeld , Germany
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Royal Observatory · University of Edinburgh
Affiliation as printed
Institute for Astronomy, School of Physics and Astronomy, University of Edinburgh, Royal Observatory Edinburgh , Blackford Hill, Edinburgh EH9 3HJ , UK
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California Institute of Technology · National Centre for Nuclear Research
Affiliation as printed
Department of Astrophysics, National Centre for Nuclear Research , Pasteura 7, PL-02-093 Warsaw , Poland
Division of Physics, Mathematics, and Astronomy, California Institute of Technology , 1200 E California Blvd, Pasadena, CA 91125 , USA
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Affiliation as printed
Department of Physics, University of Oxford , Denys Wilkinson Building, Keble Road, Oxford OX1 3RH , UK
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Affiliation as printed
Institute of Cosmology and Gravitation, University of Portsmouth , Dennis Sciama Building, Burnaby Road, Portsmouth PO1 3FX , UK
Institute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama Building, Burnaby Road, Portsmouth PO1 3FX, United Kingdom
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Center for Theoretical Physics · Polish Academy of Sciences
Affiliation as printed
Center for Theoretical Physics, Polish Academy of Sciences , al. Lotników 32/46, PL-02-668 Warsaw , Poland
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Istituto Nazionale di Fisica Nucleare, Sezione di Torino · Osservatorio Astrofisico di Torino · University of Turin · University of the Western Cape · National Institute for Astrophysics
Affiliation as printed
Department of Physics & Astronomy, University of the Western Cape , Cape Town 7535 , South Africa
Dipartimento di Fisica, Università degli Studi di Torino , Via P. Giuria 1, I-10125 Torino , Italy
INAF – Istituto Nazionale di Astrofisica, Osservatorio Astrofisico di Torino , Strada Osservatorio 20, I-10025 Pino Torinese , Italy
INFN – Istituto Nazionale di Fisica Nucleare , Sezione di Torino, Via P. Giuria 1, I-10125 Torino , Italy
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Affiliation as printed
Institut für Theoretische Physik, Fakultät für Physik und Astronomie, Universität Heidelberg , Philosophenweg 16, D-69120 Heidelberg , Germany
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Affiliation as printed
Fakultät für Physik, Universität Bielefeld , Postfach 100131, D-33501 Bielefeld , Germany
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Chinese Academy of Sciences · National Astronomical Observatories
Affiliation as printed
National Astronomical Observatories, Chinese Academy of Science , Beijing 100101 , P. R. China
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Affiliation as printed
Fakultät für Physik, Universität Bielefeld , Postfach 100131, D-33501 Bielefeld , Germany
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Royal Observatory · University of Edinburgh
Affiliation as printed
Institute for Astronomy, School of Physics and Astronomy, University of Edinburgh, Royal Observatory Edinburgh , Blackford Hill, Edinburgh EH9 3HJ , UK
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California Institute of Technology · University of the Western Cape
Affiliation as printed
Department of Physics & Astronomy, University of the Western Cape , Cape Town 7535 , South Africa
Division of Physics, Mathematics, and Astronomy, California Institute of Technology , 1200 E California Blvd, Pasadena, CA 91125 , USA
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Royal Observatory · University of Edinburgh
Affiliation as printed
Institute for Astronomy, School of Physics and Astronomy, University of Edinburgh, Royal Observatory Edinburgh , Blackford Hill, Edinburgh EH9 3HJ , UK
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National Institute for Astrophysics
Affiliation as printed
INAF-IAPS , via Fosso del Cavaliere 100, I-00133 Rome , Italy
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Leiden University · Leiden Observatory
Affiliation as printed
Leiden Observatory, Leiden University , PO Box 9513, NL-2300 RA Leiden , the Netherlands
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Leiden University · Leiden Observatory · Netherlands Institute for Radio Astronomy
Affiliation as printed
ASTRON, Netherlands Institute for Radio Astronomy , Oude Hoogeveensedijk 4, NL-7991 PD Dwingeloo , the Netherlands
Leiden Observatory, Leiden University , PO Box 9513, NL-2300 RA Leiden , the Netherlands
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