Images of shadow and thin accretion disk around Bardeen black hole surrounded by perfect fluid dark matter
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866912738359377920 |
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| author | Feng, Haiyuan Cai, Ziqiang Yan, Hao-Peng Yang, Rong-Jia Zhang, Jinjun |
| author_facet | Feng, Haiyuan Cai, Ziqiang Yan, Hao-Peng Yang, Rong-Jia Zhang, Jinjun |
| contents | We investigated the shadow and optical appearance of Bardeen black hole (BH) immersed in perfect-fluid dark matter (PFDM). Using the EHT data, we find that the DM parameter is restricted to a narrow allowed range, confined to values of $\mathcal{O}(10^{-1}-10^{-2})$. Additionally, we observed that increasing the DM parameter substantially enlarges the photon sphere, the critical impact parameter, and thus the shadow radius, whereas the magnetic charge $g$ produces only negligible corrections. The DM component also modifies the optical appearance of the accretion disk: higher $b$ systematically suppresses the observed radiation intensity and reduces image brightness, while changes in $g$ yield only marginal effects. Subsequently, using the Novikov-Thorne thin disk model, we analyze primary and secondary images, observed flux, and redshift patterns, showing that PFDM noticeably alters image size and brightness whereas magnetic charge has a negligible influence. No blueshifted regions appear in any configuration. These results highlight several promising observational signatures for testing DM environments and nonlinear electrodynamic effects around BHs. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_00824 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Images of shadow and thin accretion disk around Bardeen black hole surrounded by perfect fluid dark matter Feng, Haiyuan Cai, Ziqiang Yan, Hao-Peng Yang, Rong-Jia Zhang, Jinjun High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology We investigated the shadow and optical appearance of Bardeen black hole (BH) immersed in perfect-fluid dark matter (PFDM). Using the EHT data, we find that the DM parameter is restricted to a narrow allowed range, confined to values of $\mathcal{O}(10^{-1}-10^{-2})$. Additionally, we observed that increasing the DM parameter substantially enlarges the photon sphere, the critical impact parameter, and thus the shadow radius, whereas the magnetic charge $g$ produces only negligible corrections. The DM component also modifies the optical appearance of the accretion disk: higher $b$ systematically suppresses the observed radiation intensity and reduces image brightness, while changes in $g$ yield only marginal effects. Subsequently, using the Novikov-Thorne thin disk model, we analyze primary and secondary images, observed flux, and redshift patterns, showing that PFDM noticeably alters image size and brightness whereas magnetic charge has a negligible influence. No blueshifted regions appear in any configuration. These results highlight several promising observational signatures for testing DM environments and nonlinear electrodynamic effects around BHs. |
| title | Images of shadow and thin accretion disk around Bardeen black hole surrounded by perfect fluid dark matter |
| topic | High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2512.00824 |