Cosmology from LOFAR Two-metre Sky Survey data release 2: angular clustering of radio sources
Covering ∼ 5600 deg2 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...
| Main Authors: | , , , , , , , , , , , , , , , , , , , |
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| Formato: | Journal article |
| Idioma: | English |
| Publicado: |
Oxford University Press
2023
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| _version_ | 1826312421190402048 |
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| author | Hale, CL Schwarz, DJ Best, PN Nakoneczny, SJ Alonso, D Bacon, D Böhme, L Bhardwaj, N Bilicki, M Camera, S Heneka, CS Pashapour-Ahmadabadi, M Tiwari, P Zheng, J Duncan, KJ Jarvis, MJ Kondapally, R Magliocchetti, M Rottgering, HJA Shimwell, TW |
| author_facet | Hale, CL Schwarz, DJ Best, PN Nakoneczny, SJ Alonso, D Bacon, D Böhme, L Bhardwaj, N Bilicki, M Camera, S Heneka, CS Pashapour-Ahmadabadi, M Tiwari, P Zheng, J Duncan, KJ Jarvis, MJ Kondapally, R Magliocchetti, M Rottgering, HJA Shimwell, TW |
| author_sort | Hale, CL |
| collection | OXFORD |
| description | Covering ∼ 5600 deg2 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 per cent of the observed area. Using the clustering, we infer the bias assuming two evolutionary models. When fitting angular scales of 0.5 ≤ θ < 5◦, using a linear bias model, we find LoTSS-DR2 sources are biased tracers of the underlying matter, with a bias of bC = 2.14+0.22 −0.20 (assuming constant bias) and bE(z = 0) = 1.79+0.15 −0.14 (for an evolving model, inversely proportional to the growth factor), corresponding to bE = 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 bC = 2.02+0.17 −0.16 and bE(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. |
| first_indexed | 2024-03-07T08:30:03Z |
| format | Journal article |
| id | oxford-uuid:178aaeb7-460e-4342-83ca-0b9e6beaa4c0 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T08:30:03Z |
| publishDate | 2023 |
| publisher | Oxford University Press |
| record_format | dspace |
| spelling | oxford-uuid:178aaeb7-460e-4342-83ca-0b9e6beaa4c02024-03-06T15:50:14ZCosmology from LOFAR Two-metre Sky Survey data release 2: angular clustering of radio sourcesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:178aaeb7-460e-4342-83ca-0b9e6beaa4c0EnglishSymplectic ElementsOxford University Press2023Hale, CLSchwarz, DJBest, PNNakoneczny, SJAlonso, DBacon, DBöhme, LBhardwaj, NBilicki, MCamera, SHeneka, CSPashapour-Ahmadabadi, MTiwari, PZheng, JDuncan, KJJarvis, MJKondapally, RMagliocchetti, MRottgering, HJAShimwell, TWCovering ∼ 5600 deg2 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 per cent of the observed area. Using the clustering, we infer the bias assuming two evolutionary models. When fitting angular scales of 0.5 ≤ θ < 5◦, using a linear bias model, we find LoTSS-DR2 sources are biased tracers of the underlying matter, with a bias of bC = 2.14+0.22 −0.20 (assuming constant bias) and bE(z = 0) = 1.79+0.15 −0.14 (for an evolving model, inversely proportional to the growth factor), corresponding to bE = 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 bC = 2.02+0.17 −0.16 and bE(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. |
| spellingShingle | Hale, CL Schwarz, DJ Best, PN Nakoneczny, SJ Alonso, D Bacon, D Böhme, L Bhardwaj, N Bilicki, M Camera, S Heneka, CS Pashapour-Ahmadabadi, M Tiwari, P Zheng, J Duncan, KJ Jarvis, MJ Kondapally, R Magliocchetti, M Rottgering, HJA Shimwell, TW Cosmology from LOFAR Two-metre Sky Survey data release 2: angular clustering of radio sources |
| title | Cosmology from LOFAR Two-metre Sky Survey data release 2: angular clustering of radio sources |
| title_full | Cosmology from LOFAR Two-metre Sky Survey data release 2: angular clustering of radio sources |
| title_fullStr | Cosmology from LOFAR Two-metre Sky Survey data release 2: angular clustering of radio sources |
| title_full_unstemmed | Cosmology from LOFAR Two-metre Sky Survey data release 2: angular clustering of radio sources |
| title_short | Cosmology from LOFAR Two-metre Sky Survey data release 2: angular clustering of radio sources |
| title_sort | cosmology from lofar two metre sky survey data release 2 angular clustering of radio sources |
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