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Recent advances in cosmic-ray detectors have provided exceptionalsensitivities of dark matter with high angular resolution. Motivated by this,we present a comprehensive study of cosmic-ray flux from dark matter decay indwarf spheroidal galaxies (dSphs), with a focus on detectors possessingarcsecond-level field of view and/or angular resolution. We propose to usedifferential $D$-factors, which are estimated for various dSphs since suchdetectors are sensitive to their dark matter distributions. Our findings revealthat the resulting signal flux can experience a more than $O$(1-10) enhancementwith different theoretical uncertainty compared to traditional estimations.Based on this analysis, we find that the Infrared Camera and Spectrograph(IRCS) installed on the 8.2m Subaru telescope can be a good dark matterdetector for the mass in the eV range, particularly axion-like particles(ALPs). Observing the Draco or Ursa Major II galaxies with the IRCS for just afew nights will be sufficient to surpass the stellar cooling bounds for ALPdark matter with a mass in the range of $1\,{\rm eV} \lesssim m_a \lesssim2\,\rm eV$.

Indirect Detection of Decaying Dark Matter with High Angular Resolution: Case for axion search by IRCS at Subaru Telescope