Using M87's infrared-to-ultraviolet observations, the authors constrain the axion-photon coupling for eV-scale axion-like particle dark matter, claiming order-of-magnitude improvements over previous bounds at masses from 8 to 20 eV.
Thermal and Non-Thermal Infrared Emission from M87
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abstract
We discuss images of M87 from 3.6 to 160 um obtained with Spitzer. As found previously, there is an excess in the far infrared over a simple power law interpolation from the radio to the resolved nonthermal features in the mid-infrared and optical. We show that this excess is most likely warm dust in the galaxy itself, and that the properties of this emission component are similar to the far infrared emission of normal giant elliptical galaxies. The new observations let us determine the spectrum of the jet and surrounding lobes of nonthermal emission. We find that even in the lobes the synchrotron break frequency is in the optical, probably requiring in situ particle acceleration not only in the jet but in the lobes as well.
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Constraining eV-scale axion-like particle dark matter: insights from the M87 Galaxy
Using M87's infrared-to-ultraviolet observations, the authors constrain the axion-photon coupling for eV-scale axion-like particle dark matter, claiming order-of-magnitude improvements over previous bounds at masses from 8 to 20 eV.