Searching for axion dark matter with MeerKAT Radio Telescope

Abstract

Axions provide a natural and well-motivated dark matter candidate, with the capability to convert directly to photons in the presence of an electromagnetic field. A particularly compelling observational target is the conversion of dark matter axions into photons in the magnetospheres of highly magnetised neutron stars, which is expected to produce a narrow spectral peak centred at the frequency of the axion mass. We point the MeerKAT radio telescope towards the isolated neutron star J0806.4$-$4123 for $10$-hours of observation and obtain the radio spectra in the frequency range $769$-$1051$ MHz. By modelling the conversion process of infalling axion dark matter (DM), we then compare these spectra to theoretical expectations for a given choice of axion parameters. Whilst finding no signal above $5\sigma$ in the data, we provide a unique constraint on the Primakoff coupling of axion DM, $g_{\mathrm{a}\gamma \gamma }\lesssim 9.3\times 10^{-12}{\mathrm{GeV}}^{-1}$ at the $95\%$ confidence level, in the mass range $3.18$-$4.35\mu$eV. This result serves the strongest constraint in the axion mass range $4.20$-$4.35\mu$eV.

6 pages, 3 figures, accepted by Physical Review D

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Cited by in corpus (8)

• Searching for Time-Dependent Axion Dark Matter Signals in Pulsars
• Polarization Signals from Axion-Photon Resonant Conversion in Neutron Star Magnetosphere
• Constraining Axion-Like Particles Dark Matter in Coma Berenices with FAST
• Axions in Andromeda: Searching for Minicluster -- Neutron Star Encounters with the Green Bank Telescope
• Constraints on axionlike particles from 16.5 years of Fermi-LAT data and prospects for VLAST
• Physics beyond the Standard Model with the DSA-2000
• Axion-Photon Conversion Signals from Neutron Stars with Spacetime Curvature Accounted for in the Magnetosphere Model
• Detecting the $\pi$-axiverse through parametric resonance