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 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.
Authors
- Thilo M. Siewert (ORCID: https://orcid.org/0000-0001-7552-9628)
- Maciej Bilicki (ORCID: https://orcid.org/0000-0002-3910-5809)
- Dominik J. Schwarz (ORCID: https://orcid.org/0000-0003-2413-0881)
- Benedict Bahr-Kalus (ORCID: https://orcid.org/0000-0002-4578-4019)
- Caroline Heneka (ORCID: https://orcid.org/0000-0001-8883-0583)
- Prabhakar Tiwari (ORCID: https://orcid.org/0000-0001-7888-4270)
- Lukas Böhme (ORCID: https://orcid.org/0000-0002-3065-6997)
- Catherine Hale (ORCID: https://orcid.org/0000-0001-6279-4772)
- Morteza Pashapour-Ahmadabadi (ORCID: https://orcid.org/0009-0006-6542-5909)
Institutions
- Technion – Israel Institute of Technology (IL)
- Bielefeld University (DE)
- Heidelberg University (DE)
- Center for Theoretical Physics (PL)
- University of Oxford (GB)
- Istituto Nazionale di Fisica Nucleare, Sezione di Torino (IT)
- Evangelisches Krankenhaus Bielefeld (DE)
- Osservatorio Astrofisico di Torino (IT)
- University of Turin (IT)
- Bethel University (US)
- Polish Academy of Sciences (PL)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2025-11-10
- DOI
- https://doi.org/10.1103/6z32-3zf4
- Citations
- 1
- Primary Topic
- Electromagnetic Compatibility and Measurements
- Type
- article
- Field-Weighted Citation Impact
- 0.73