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The observable characteristics of the charged black hole (BH) surrounded by athin disk accretion are investigated in the Rastall gravity. We found that theradii of the direct emission, lensing ring, and photon ring dramaticallyincreased as the radiation field parameter increases, but they only weaklydepend on the BH charge. Three positions of the radiation accretion diskrelative to the BH are considered, i.e., the innermost accretion disk is closedto the radii of the innermost stable circular orbit, the photon ring of the BH,and the event horizon of the BH. The observed images in three casesrespectively are obtained. It is found that the total observed flux isdominated by the direct emission, the lensing ring provides a smallcontribution, and the photon ring is negligible. The lensing and photon ringscould not be observed in the blurred image with the EHT resolution. Our resultssuggest that the observable characteristics of the charged BH surrounded by thethin disk accretion in the Rastall gravity depend on both the BH space-timestructure and the position of the radiating accretion disk with respect to theBH. The research of these BH images may serve as a probe for the BH-diskstructure in M87$^{*}$ like nearby active galactic nuclei.

Observable characteristics of the charged black hole surrounded by thin disk accretion in Rastall gravity