A Search for Axionic Dark Matter Using the Magnetar PSR J1745-2900

Understand

We report on a search for dark matter axion conversion photons from the magnetosphere of the Galactic Center magnetar PSR J1745-2900 using spectra obtained from the Karl G.

• Jansky Very Large Array.
• No significant spectral features are detected.
• Using a hybrid model for PSR J1745-2900 and canonical assumptions about the dark matter density profile, we exclude axion models with axion-photon coupling $g_{a\gamma\gamma}$ > 6-34 x 10$^{-12}$ GeV$^{-1}$ with 95% confidence over the mass ranges 4.2-8.4, 18.6-26.9, 33.0-41.4, 53.7-62.1, and 126.0-159.3 $\mu$eV.