Kavli Affiliate: Kiyoshi Wesley Masui
| First 5 Authors: Yitian Sun, Katelin Schutz, Harper Sewalls, Calvin Leung, Kiyoshi Wesley Masui
| Summary:
Axion dark matter (DM) produces echo images of bright radio sources via
stimulated decay. These images appear as a faint radio line centered at half
the axion mass, with the line width set by the DM velocity dispersion. Due to
the kinematics of the decay, the echo can be emitted in the direction nearly
opposite to the incoming source of stimulating radiation, meaning that axions
effectively behave as imperfect monochromatic mirrors. We present an all-sky
analysis of axion DM-induced echo images using extragalactic radio point
sources, Galactic supernova remnants (SNRs), and Galactic synchrotron radiation
(GSR) as sources of stimulating radiation. The aggregate signal strength is not
significantly affected by unknown properties of individual sources of
stimulating radiation, which we sample from an empirical distribution to
generate an ensemble of realizations for the all-sky signal template. We
perform forecasts for CHIME, HERA, CHORD, HIRAX, and BURSTT, finding that they
can run as competitive axion experiments simultaneously with other objectives,
requiring no new hardware.
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