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Shadows of black holes with dark matter halo

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arxiv 2303.17666 v1 pith:BEAZJOLF submitted 2023-03-30 gr-qc

Sérgio V. M. C. B. Xavier , Haroldo C. D. Lima Junior , Luís C. B. Crispino This is my paper · ORCID
classification gr-qc
keywords blackholedarkmatterhaloshadowseventgravitational
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We investigate the shadow of an exact black hole solution of Einstein's equations recently proposed by Cardoso et al., to describe a supermassive black hole immersed in a dark matter halo. We analyze and discuss the light rings and the gravitational lensing of this spacetime comparing them with an isolated Schwarzschild black hole. Using backward ray-tracing techniques, we study the shadows cast by such black hole when illuminated by a celestial sphere that emits radiation isotropically. We find that when the dark matter distribution concentrates near the event horizon of the black hole, multiple light rings emerge. In this high compactness regime, the shadows and gravitational lensing are significantly different from the Schwarzschild one. We also use the M87* and SgrA* shadow data, obtained by the Event Horizon Telescope collaboration, to constrain the parameters of the dark matter halo.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Spinning generalizations of Majumdar-Papapetrou multi-black hole spacetimes: light rings, lensing and shadows

    gr-qc 2025-02 conditional novelty 6.0 of 10

    For the Teo-Wan two-black-hole spacetime, light rings merge and annihilate in pairs, giving total counts of 4, 6, or 8, and the shadows mimic double-Kerr.

  2. Matter environments around black holes: geodesics, light rings, and ultracompact configurations

    gr-qc 2025-12 conditional novelty 5.0 of 10

    Dark-matter halos modeled as Einstein clusters generically move the ISCO inward and the light ring outward, and ultracompact halos can add extra light rings, trapped modes, and secondary horizons.

  3. Multiscale probing of a Hernquist-type environmental black hole spacetime with the Sgr A* shadow and S2 orbital dynamics

    gr-qc 2026-08 conditional novelty 4.0 of 10

    Observations of Sgr A*'s shadow and the S2 star's orbit constrain the Hernquist-type environmental halo compactness to below about 10^-4, while its radial scale stays bimodally degenerate.

  4. Shadow and Quasi-Normal Modes of Schwarzschild-Hernquist Black Hole

    gr-qc 2025-09 conditional novelty 4.0 of 10

    For black holes embedded in Hernquist dark matter halos, the shadow radius and quasinormal mode frequencies are redshifted by a factor 1 - C + C^2/6 in the halo compactness C, with EHT observations implying C <= 0.092.

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