A possible radio signal of annihilating dark matter in the Abell 4038 cluster
| Autor: | Chak Man Lee, Man Ho Chan |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Quark
Physics Annihilation 010308 nuclear & particles physics Astrophysics::High Energy Astrophysical Phenomena Dark matter Gamma ray Astronomy and Astrophysics Cosmic ray Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 01 natural sciences Galaxy Positron Pulsar Space and Planetary Science 0103 physical sciences 010303 astronomy & astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society: Letters. 495:L124-L128 |
| ISSN: | 1745-3933 1745-3925 |
| DOI: | 10.1093/mnrasl/slz185 |
| Popis: | In the past decade, some telescopes [e.g. Fermi-Large Area Telescope (LAT), Alpha Magnetic Spectrometer(AMS), and Dark Matter Particle Explorer(DAMPE)] were launched to detect the signals of annihilating dark matter in our Galaxy. Although some excess of gamma-rays, antiprotons, and electrons/positrons have been reported and claimed as dark matter signals, the uncertainties of Galactic pulsars’ contributions are still too large to confirm the claims. In this Letter, we report a possible radio signal of annihilating dark matter manifested in the archival radio continuum spectral data of the Abell 4038 cluster. By assuming the thermal annihilation cross-section and comparing the dark matter annihilation model with the null hypothesis (cosmic ray emission without dark matter annihilation), we get very large test statistic values >45 for four popular annihilation channels, which correspond to more than 6.5σ statistical preference. This provides a very strong evidence for the existence of annihilating dark matter. In particular, our results also support the recent claims of dark matter mass m ≈ 30–50 GeV annihilating via the bb̄ quark channel with the thermal annihilation cross-section. |
| Databáze: | OpenAIRE |
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