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Overdispersed radio source counts and excess radio dipole detection

The source count dipole from wide-area radio continuum surveys allows us to test the cosmological standard model. Many radio sources have multiple components, which can cause an overdispersion of the source counts distribution. We account for this effect via a new Bayesian estimator, based on the ne...

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Hauptverfasser: Böhme, Lukas (VerfasserIn) , Schwarz, Dominik J. (VerfasserIn) , Tiwari, Prabhakar (VerfasserIn) , Pashapour-Ahmadabadi, Morteza (VerfasserIn) , Bahr-Kalus, Benedict (VerfasserIn) , Bilicki, Maciej (VerfasserIn) , Hale, Catherine L. (VerfasserIn) , Heneka, Caroline (VerfasserIn) , Siewert, Thilo M. (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 10 November, 2025
In: Physical review letters
Year: 2025, Jahrgang: 135, Heft: 20, Pages: 1-10
ISSN:1079-7114
DOI:10.1103/6z32-3zf4
Online-Zugang:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/6z32-3zf4
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/6z32-3zf4
Volltext
Verfasserangaben:Lukas Böhme, Dominik J. Schwarz, Prabhakar Tiwari, Morteza Pashapour-Ahmadabadi, Benedict Bahr-Kalus, Maciej Bilicki, Catherine L. Hale, Caroline S. Heneka, and Thilo M. Siewert
Beschreibung
Zusammenfassung:The source count dipole from wide-area radio continuum surveys allows us to test the cosmological standard model. Many radio sources have multiple components, which can cause an overdispersion of the source counts distribution. We account for this effect via a new Bayesian estimator, based on the negative binomial distribution. Combining the two best understood wide-area surveys, NVSS and RACS-low, and the deepest wide-area survey, LoTSS-DR2, we find that the source count dipole exceeds its expected value as the kinematic dipole amplitude from standard cosmology by a factor of 3.67±0.49—a 5.4⁢𝜎 discrepancy.
Beschreibung:Veröffentlicht: 10. November 2025
Gesehen am 29.01.2026
Beschreibung:Online Resource
ISSN:1079-7114
DOI:10.1103/6z32-3zf4

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