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PreprintCC BY 4.0arXiv

Shadow, Emission, and Strong-Field Lensing of Dilatonic Black Holes

  • Kuantay Boshkayev
  • Ainur Urazalina
  • Aidana Kurmanbek
  • Manas Khassanov
  • Daniya Utepova
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Abstract

We study the shadow and strong-field optical properties of a static, spherically symmetric dyon-like dilatonic black hole. The photon sphere radius, critical impact parameter, and shadow radius are obtained and analyzed in terms of the charge Q and the dilatonic coupling parameter a. We show that increasing these parameters decreases the photon sphere and shadow radii, leading to a smaller apparent shadow. The predicted angular diameter is compared with the observational data for M87* and SgrA*. We explicitly show that the Sgr A* data do not constrain the model parameters, whereas the results for M87* depend on the adopted mass estimates from stellar and gas dynamics. We also estimate the high-frequency energy emission rate in the geometric-optics approximation and derive the leading Bozza coefficient a̅, which characterizes the logarithmic behavior of the deflection angle in the strong-field regime. Astrophysical implication of the obtained outcomes are discussed.

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Cite

BibTeXRIS
BibTeX
@misc{boshkayev2026shadow,
  title = {{Shadow, Emission, and Strong-Field Lensing of Dilatonic Black Holes}},
  author = {Kuantay Boshkayev and Ainur Urazalina and Aidana Kurmanbek and Manas Khassanov and Daniya Utepova},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2606.17284},
  eprint = {2606.17284},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2606.17284},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Shadow, Emission, and Strong-Field Lensing of Dilatonic Black Holes
AU  - Kuantay Boshkayev
AU  - Ainur Urazalina
AU  - Aidana Kurmanbek
AU  - Manas Khassanov
AU  - Daniya Utepova
PY  - 2026
DA  - 2026/10/27
PB  - arXiv
DO  - 10.48550/arxiv.2606.17284
UR  - https://arxiv.org/abs/2606.17284
AB  - We study the shadow and strong-field optical properties of a static, spherically symmetric dyon-like dilatonic black hole. The photon sphere radius, critical impact parameter, and shadow radius are obtained and analyzed in terms of the charge Q and the dilatonic coupling parameter a. We show that increasing these parameters decreases the photon sphere and shadow radii, leading to a smaller apparent shadow. The predicted angular diameter is compared with the observational data for M87^* and SgrA^*. We explicitly show that the Sgr A* data do not constrain the model parameters, whereas the results for M87* depend on the adopted mass estimates from stellar and gas dynamics. We also estimate the high-frequency energy emission rate in the geometric-optics approximation and derive the leading Bozza coefficient a̅, which characterizes the logarithmic behavior of the deflection angle in the strong-field regime. Astrophysical implication of the obtained outcomes are discussed.
ER  -