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In a recent work by Fernandes [arXiv:2305.10382], an exact stationary andaxisymmetric solution was discovered in semiclassical gravity with type-A traceanomaly, identified as a quantum-corrected version of the Kerr black hole. Inthis study, we explore the observational signatures of this black holesolution. Our investigation reveals that there exist prograde and retrogradelight rings, whose radii increase monotonically with the coupling parameter$\alpha$. We also observe that when $\alpha$ is negative, the shadow area forthe quantum-corrected black hole is smaller than that of the Kerr black hole,whereas when $\alpha$ is positive, the area is larger. Furthermore, for anear-extremal black hole, its high-spin feature (the NHEKline) is found to behighly susceptible to disruption by $\alpha$. Moreover, we discuss the imagesof the quantum-corrected black hole in the presence of a thin accretion diskand compare them to those of the Kerr black hole. Our study highlights theimportance of near-horizon emission sources in detecting the effects of quantumcorrections by black hole images.

Observational signatures of rotating black holes in the semiclassical gravity with trace anomaly