The feature of shadow images and observed luminosity of the Bardeen black hole surrounded by different accretions

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In this paper, by exploring the photon motion in the region near the Bardeen black hole, the shadow and observation properties of the black hole surrounded by various accretion models are studied.

• We analyzed the changes in shadow imaging and observation luminosity when the relevant physical parameters are changed.
• For the different spherical accretions background, one can find that the radius of shadow and the position of photon sphere do not change, but the observation intensity of shadow in the infalling accretion model is significantly lower than that of the static case.
• When the black hole is surrounded by an optically and thin disk accretion, the contribution of the photon rings, lensing rings and direct emission to the total observed flux has also been studied.