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In this paper, we first analyze the horizon structure of the acoustic chargedblack hole in curved spacetime, and then study its acoustic shadow as well asthe near-horizon characteristics including the quasinormal modes (QNM)frequencies and analogue Hawking radiation. We find that the radius of theacoustic shadow for acoustic charged black hole is larger than that forReissner-Nordstr\"{o}m (RN) black hole, and both of them are suppressed byincreasing the black hole charge because their related outer horizons becomesmaller. Then the QNM frequencies under scalar field perturbation and itseikonal limit are computed via numeric method and acoustic shadow,respectively. We find that the acoustic charged black hole is stable under theperturbation and the QNM frequencies are much weaker than that for theastrophysical black hole. Moreover, as the tuning parameter increases, theperturbation oscillates more mildly and its damping time becomes longer, whileas the charge increases, the oscillation is enhanced slightly and theperturbation decays a little faster which is different from that in RN blackhole. Finally, we numerically study the analogue Hawking radiation. We findthat the grey-body factor and energy emission rate are suppressed by theangular number and the charge, but they do not monotonically depend on thetuning parameter in the acoustic charged black hole. The behavior of the energyemission rate affected by the parameters could be explained by the dependentbehavior of the Hawking temperature. We expect that our results could shedlight to the study of black holes in both theoretical and experimentalperspectives.

Shadow and near-horizon characteristics of the acoustic charged black hole in curved spacetime