Radiation properties of a regular black hole embedded in a Dehnen-type dark matter halo with a thin accretion disk
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| Main Authors: | , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866911618451898368 |
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| author | Ren, Tianyou Zhao, Jing-Ya Liu, Xiaomei Yang, Rong-Jia |
| author_facet | Ren, Tianyou Zhao, Jing-Ya Liu, Xiaomei Yang, Rong-Jia |
| contents | We investigate the shadow, timelike geodesic structure, radiation properties of thin accretion disks, and optical appearance of a static spherically symmetric regular black hole, constructed based on the Dehnen-type density profile. Using observational data from M87* and Sgr A*, we constrain the model parameter $a$ at both $1σ$ and $2σ$ confidence levels. Based on the Page--Thorne model, we calculate the local radiative flux, redshift factor distribution, and the radiation flux received by a distant observer, systematically examining the effects of the parameter $a$ and the viewing angle on the black hole image. The results show that larger $a$ will enlarge the effective radiation area of the accretion disk and significantly enhance the asymmetry and Doppler boosting effects of the direct and secondary images at large viewing angles. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_21615 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Radiation properties of a regular black hole embedded in a Dehnen-type dark matter halo with a thin accretion disk Ren, Tianyou Zhao, Jing-Ya Liu, Xiaomei Yang, Rong-Jia General Relativity and Quantum Cosmology We investigate the shadow, timelike geodesic structure, radiation properties of thin accretion disks, and optical appearance of a static spherically symmetric regular black hole, constructed based on the Dehnen-type density profile. Using observational data from M87* and Sgr A*, we constrain the model parameter $a$ at both $1σ$ and $2σ$ confidence levels. Based on the Page--Thorne model, we calculate the local radiative flux, redshift factor distribution, and the radiation flux received by a distant observer, systematically examining the effects of the parameter $a$ and the viewing angle on the black hole image. The results show that larger $a$ will enlarge the effective radiation area of the accretion disk and significantly enhance the asymmetry and Doppler boosting effects of the direct and secondary images at large viewing angles. |
| title | Radiation properties of a regular black hole embedded in a Dehnen-type dark matter halo with a thin accretion disk |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2604.21615 |