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Green Bank and Effelsberg Radio Telescope Searches for Axion Dark Matter Conversion in Neutron Star Magnetospheres

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arxiv 2004.00011 v1 pith:QUCN26P3 submitted 2020-03-31 astro-ph.CO astro-ph.HEhep-ph

Joshua W. Foster , Yonatan Kahn , Oscar Macias , Zhiquan Sun , Ralph P. Eatough , Vladislav I. Kondratiev , Wendy M. Peters , Christoph Weniger
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Benjamin R. Safdi
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classification astro-ph.COastro-ph.HEhep-ph
keywords axionneutrontelescopebankconversiondarkeffelsberggreen
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abstract

Axion dark matter (DM) may convert to radio-frequency electromagnetic radiation in the strong magnetic fields around neutron stars. The radio signature of such a process would be an ultra-narrow spectral peak at a frequency determined by the mass of the axion particle. We analyze data we collected from the Robert C. Byrd Green Bank Telescope in the L-band and the Effelsberg 100-m Telescope in the L-Band and S-band from a number of sources expected to produce bright signals of axion-photon conversion, including the Galactic Center of the Milky Way and the nearby isolated neutron stars RX J0720.4-3125 and RX J0806.4-4123. We find no evidence for axion DM and are able to set some of the strongest constraints to-date on the existence of axion DM in the highly-motivated mass range between ~5-11 $\mu$eV.

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Forward citations

Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Gravitational Wave Scattering on Magnetic Fields

    gr-qc 2025-07 accept novelty 7.0 of 10

    In a 3D treatment of the inverse Gertsenshtein effect, an isotropic unpolarized gravitational wave background scattering off a dipolar magnetic field yields partially linearly polarized radio emission, with peak inten...

  2. Searching for Axion Dark Matter Near Relaxing Magnetars

    hep-ph 2025-05 conditional novelty 6.0 of 10

    Resonant axion-to-photon conversion near magnetars could be observable with ALMA and SKA, but the predicted line strength and frequency depend heavily on which plasma model is correct.

  3. Galactic Centre Pulsars with the SKAO

    astro-ph.HE 2026-07 accept novelty 4.0 of 10

    Updated SKA-MID sensitivity and multi-beam search strategies can detect up to ~84% of Galactic Centre pulsars (and ~60% of MSPs) under magnetar-like scattering, unlocking precision tests around Sgr A*.

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