On the Galactic radio signal from stimulated decay of axion dark matter

Understand

We study the full-sky distribution of the radio emission from the stimulated decay of axions which are assumed to compose the dark matter in the Galaxy.

• Besides the constant extragalactic and CMB components, the decays are stimulated by a Galactic radio emission with a spatial distribution that we empirically determine from observations.
• We compare the diffuse emission to the counterimages of the brightest supernovae remnants, and take into account the effects of free-free absorption.
• We show that, if the dark matter halo is described by a cuspy NFW profile, the expected signal from the Galactic center is the strongest.