Looking for Axion Dark Matter in Dwarf Spheroidals

Abstract

We study the extent to which the decay of cold dark matter axions can be probed with forthcoming radio telescopes such as the Square Kilometer Array (SKA). In particular we focus on signals arising from dwarf spheroidal galaxies, where astrophysical uncertainties are reduced and the expected magnetic field strengths are such that signals arising from axion decay may dominate over axion-photon conversion in a magnetic field. We show that with $\sim 100$ hours of observing time, SKA could improve current sensitivity by a factor of about five.

arXiv commentv3: Corrected err in sensitivity, figure 1 and 3 replaced, and text modified appropriately. v2: Published version. v1: 7 pages, 3 figures

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