Optical appearance of black holes surrounded by a dark matter halo

Abstract

Black holes in General Relativity are described by space-time metrics that are simpler in comparison to non-vacuum compact objects. However, given the universality of the gravitational pull, it is expected that dark matter accumulates around astrophysical black holes, which can have an impact in the overall gravitational field, especially at galactic centers, and induce non-negligible effects in their observational imprints. In this work we study the optical appearance of a spherically symmetric black hole both when orbited by isotropically emitting light sources and when surrounded by a (geometrically and optically thin) accretion disk, while immersed in a dark matter halo. The black hole geometry plus the dark matter halo come as a solution of Einstein's field equations coupled to an anisotropic fluid whose density component follows a Hermquist-type distribution. Even in situations in which the geodesic description differs profoundly from the isolated black hole case, we find minor modifications to the primary and secondary tracks of the isotropic orbiting sources, and to the width, location, and relative luminosity of the corresponding photon rings as compared to the Schwarzschild black hole at equal black hole mass and emission models. This fact troubles distinguishing between both geometries using present observations of very-long baseline interferometry.

21 pages, 17 figures

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• Superradiance of charged black holes embedded in dark matter halos
• Black hole in the Dekel-Zhao dark matter profile
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• Galactic black hole immersed in a dark halo with its surrounding thin accretion disk
• Can light-rings self-gravitate?
• Charged black hole surrounded by a galactic halo in de Sitter universe
• Remarks on the light ring images and the optical appearance of hairy black holes in Einstein-Maxwell-dilaton gravity
• Thin Accretion Disk Around Rotating Hairy Black Hole: Radiative Property and Optical Appearance
• Observational signatures from higher-order images of moving hotspots in accretion disks
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• Shadows and Observational Images of a Schwarzschild-like Black Hole Surrounded by a Dehnen-type Dark Matter Halo
• Spectral instability of horizonless compact objects within astrophysical environments
• Shadow of the Scalar Hairy Black Hole with Inverted Higgs Potential
• Shadow of quadrupole-deformed compact objects in a local dark matter shell
• Tidal forces around the Letelier-Alencar cloud of strings black hole
• Accretion of matter of a new bumblebee black hole
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• Imaging the destruction of a rotating regular black hole
• Gravitational memory meets astrophysical environments: exploring a new frontier through osculations