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...
Saved in:
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Article (Journal) |
| Language: | English |
| Published: |
10 November, 2025
|
| In: |
Physical review letters
Year: 2025, Volume: 135, Issue: 20, Pages: 1-10 |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/6z32-3zf4 |
| Online Access: | Verlag, kostenfrei, Volltext: https://doi.org/10.1103/6z32-3zf4 Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/6z32-3zf4 
|
| Author Notes: | 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 |
| Summary: | 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 5.4𝜎 discrepancy. |
|---|---|
| Item Description: | Veröffentlicht: 10. November 2025 Gesehen am 29.01.2026 |
| Physical Description: | Online Resource |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/6z32-3zf4 |