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We have studied the signals from axion-like particles (ALPs) as dark mattermediators from celestial objects such as neutron stars or brown dwarfs. Weconsider the accumulation of dark matter inside the celestial objects using themultiscatter capturing process. The production of ALP from the dark matterannihilation can escape the celestial object and decay into gamma-ray andneutrinos before reaching the Earth. We investigate our model using gamma-rayobservations from Fermi and H.E.S.S and neutrino observations from IceCube andANTARES. The effective Lagrangian approach allows us to place constraints onthe ALP-photon and ALP-fermion couplings. In the gamma-ray channel, our resultsimprove the existing bounds on ALPs by 1-2 orders of magnitude. Although theconstraints from neutrino fluxes rule out a significant portion of theparameter space, the remaining part of the parameter space is accessible byfuture experiments.

Bounds on ALP-Mediated Dark Matter Models from Celestial Objects