Abstract
Aims. We combined the LOw-Frequency ARray (LOFAR) Two-metre Sky Survey (LoTSS) second data release (DR2) catalogue with gravitational lensing maps from the cosmic microwave background (CMB) to place constraints on the bias evolution of LoTSS-detected radio galaxies, and on the amplitude of matter perturbations.
Methods. We constructed a flux-limited catalogue from LoTSS DR2, and analysed its harmonic-space cross-correlation with CMB lensing maps from Planck, Cℓgk, as well as its auto-correlation, Cℓgg. We explored the models describing the redshift evolution of the large-scale radio galaxy bias, discriminating between them through the combination of both Cℓgk and Cℓgg. Fixing the bias evolution, we then used these data to place constraints on the amplitude of large-scale density fluctuations, parametrised by σ8.
Results. We report the significance of the Cℓgk signal at a level of 26.6σ. We determined that a linear bias evolution of the form bg(z) = bg,D/D(z), where D(z) is the growth rate, is able to provide a good description of the data, and we measured bg,D = 1.41 ± 0.06 for a sample that is flux limited at 1.5 mJy, for scales ℓ < 250 for Cℓgg, and ℓ < 500 for Cℓgk. At the sample’s median redshift, we obtained b(z = 0.82) = 2.34 ± 0.10. Using σ8 as a free parameter, while keeping other cosmological parameters fixed to the Planck values, we found fluctuations of σ8 = 0.75−0.04+0.05. The result is in agreement with weak lensing surveys, and at 1σ difference with Planck CMB constraints. We also attempted to detect the late-time-integrated Sachs-Wolfe effect with LOFAR data; however, with the current sky coverage, the cross-correlation with CMB temperature maps is consistent with zero. Our results are an important step towards constraining cosmology with radio continuum surveys from LOFAR and other future large radio surveys.
Funder
US National Science Foundation
Polish National Science Centre
Beecroft Trust
Science and Technology Facilities Council
Polish National Science Center
Bundesministerium für Bildung und Forschung
Ministerium fur Kultur und Wissenschaft des Landes Nordrhein-Westfahlen Profilbildung 2020
Leverhulme Trust
European Cooperation in Science and Technology
Polish Ministry for Science and Higher Education
Volkswagen Foundation
Deutsche Forschungsgemeinschaft
National Natural Science Foundation of China
Ministry of Culture and Science of the State of North Rhine-Westphalia
BMBF ErUM-Pro
STFC consolidated grant
UKRI Frontiers Research Grant
Oxford Hintze Centre for Astrophysical Surveys
MIWF-NRW
MPG
Science Foundation Ireland
Department of Business, Enterprise and Innovation (DBEI), Ireland
NWO, The Netherlands
The Science and Technology Facilities Council, UK
Ministry of Science and Higher Education, Poland
The Istituto Nazionale di Astrofisica (INAF), Italy
CNRS-INSU
Observatoire de Paris
Université d’Orléans
BMBF
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
2 articles.
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