\begin{document}$ \alpha_0 $\end{document}) and spacetime deformation factor (n). We found that the characteristic parameters give rise to some novel observable features. For these new BHs, both the shadow and photon sphere radii decrease with the increase in \begin{document}$ \alpha_0 $\end{document}, while the observed specific intensity increases. Conversely, as n increases, the shadow and photon sphere radii increase, while the observed specific intensity decreases. Under different spherical accretion scenarios, the shadows and photon sphere radii remain identical; however, the observed specific intensity is greater under static spherical accretion than under infalling spherical accretion. Additionally, we found that these regular BHs with different cores exhibit variations in shadows and optical appearances, particularly under static spherical accretion. Compared with Bardeen BH, the new BHs exhibit a lower observed specific intensity, a dimmer photon ring, and smaller shadow and photon sphere radii. Larger values of \begin{document}$ \alpha_0 $\end{document} lead to more significant differences, and a similar trend was also observed when comparing with Hayward BH. Under infalling spherical accretion, the regular BHs with different cores exhibit only slight differences in observed specific intensity, which become more evident when \begin{document}$ \alpha_0 $\end{document} is relatively large. This suggests that the unique spacetime features of these regular BHs with different cores can be distinguished through astronomical observation."> Investigating the shadows of new regular black holes with a Minkowski core: effects of spherical accretion and core type differences -
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