Images of Regular Black Holes with Hedgehog Scalar Hair Embedded in Radiatively Inefficient Accretion Flows

Ranked by how close their title and abstract are to this paper’s. Select some to read them together.

Closest papers

1. Close Not relevant

   Nozzle Shocks, Disk Tearing and Streamers Drive Rapid Accretion in 3D GRMHD Simulations of Warped Thin Disks

   Nicholas Kaaz, Matthew T. P. Liska, Jonatan Jacquemin-Ide et al. · 2022 · High Energy Astrophysical Phenomena · cited 33 times · AI summary available

   Abstract

   The angular momentum of gas feeding a black hole (BH) is typically misaligned with respect to the BH spin, resulting in a tilted accretion disk. Rotation of the BH drags the surrounding space-time, manifesting as Lense-Thirring torques that lead to disk precession and warping. We study these processes by simulating a thin ($H/r=0.02$), highly tilted ($\mathcal{T}=65^\circ$) accretion disk around a rapidly rotating ($a=0.9375$) BH at extremely high resolutions, which we performed using the general-relativistic magnetohydrodynamic (GRMHD) code H-AMR. The disk becomes significantly warped and continuously tears into two individually precessing sub-disks. We find that mass accretion rates far ex…

2. Close Not relevant

   Black hole spectral states revealed in GRMHD simulations with texture memory accelerated cooling

   Pedro Naethe Motta, Jonatan Jacquemin-Ide, Rodrigo Nemmen et al. · 2025 · High Energy Astrophysical Phenomena · cited 2 times · AI summary available

   Abstract

   X-ray binaries (XRBs) display spectral state transitions that are accompanied by substantial changes in the hardness, luminosity, and structure of the accretion flow. We developed a GPU-accelerated cooling toolkit for general relativistic magnetohydrodynamic (GRMHD) simulations of accreting black holes that uses texture memory for fast retrieval of pre-computed values. The toolkit incorporates bremsstrahlung, synchrotron, inverse Compton radiation and Coulomb collision processes. We implemented our toolkit into a GRMHD code and used it to simulate a magnetically arrested disk in the context of the XRB low/hard state around a Kerr black hole. We explored the mass accretion rate in the $\sim (…

3. Close Not relevant

   Relativistic Gas Accretion onto Supermassive Black Hole Binaries from Inspiral through Merger

   Lorenzo Ennoggi, Manuela Campanelli, Yosef Zlochower et al. · 2025 · High Energy Astrophysical Phenomena · cited 14 times · AI summary available

   Abstract

   Accreting supermassive black hole binaries are powerful multimessenger sources emitting both gravitational and electromagnetic (EM) radiation. Understanding the accretion dynamics of these systems and predicting their distinctive EM signals is crucial to informing and guiding upcoming efforts aimed at detecting gravitational waves produced by these binaries. To this end, accurate numerical modeling is required to describe both the spacetime and the magnetized gas around the black holes. In this paper, we present two key advances in this field of research. First, we have developed a novel 3D general relativistic magnetohydrodynamics (GRMHD) framework that combines multiple numerical codes to …

4. Close Not relevant

   Hot, cold, and multi-component accretion flows around supermassive black hole binaries

   Christopher Tiede, Daniel J. D'Orazio · 2025 · High Energy Astrophysical Phenomena · cited 6 times · AI summary available

   Abstract

   We develop a model for supermassive black hole binaries (SMBHBs) accreting below their Eddington limit, focusing on systems where hot, advection-dominated flows become viable. We specifically explore the spectral appearance of multi-component accretion flows where the solution can independently transition between cold, thin disks and hot, advection-dominated torii depending on the local accretion rate. Using a three-disk model, we compute spectral energy distributions for four possible accretion configurations and assess their observational signatures, including which frequencies might reflect variability at the binary orbital period. The spectral modeling reveals that binary accretion can s…

5. Close Not relevant

   Spectral analysis of a parsec-scale jet in M87: Observational constraint on the magnetic field strengths in the jet

   Hyunwook Ro, Motoki Kino, Bong Won Sohn et al. · 2023 · High Energy Astrophysical Phenomena · cited 20 times · AI summary available

   Abstract

   Because of its proximity and the large size of its black hole, M87 is one of the best targets for studying the launching mechanism of active galactic nucleus jets. Currently, magnetic fields are considered to be an essential factor in the launching and accelerating of the jet. However, current observational estimates of the magnetic field strength of the M87 jet are limited to the innermost part of the jet or to HST-1. No attempt has yet been made to measure the magnetic field strength in between. We aim to infer the magnetic field strength of the M87 jet out to a distance of several thousand $r_s$ by tracking the distance-dependent changes in the synchrotron spectrum of the jet from high-re…

6. Close Not relevant

   No Need for an Extreme Jet Energy in the Black-Hole X-Ray Binary MAXI J1348--630

   Andrzej A. Zdziarski, Marek Sikora, Michal Szanecki et al. · 2023 · High Energy Astrophysical Phenomena · cited 7 times · AI summary available

   Abstract

   We model interaction with the surrounding medium of the main discrete jet ejection in the accreting black-hole binary MAXI J1348--630. The kinetic energy in the ejection of that jet was estimated before to be $>10^{46}$ erg. That energy requires that the jet power was about two orders of magnitude above the limit corresponding to a magnetically arrested accretion onto a maximally rotating black hole. That estimate was obtained by considering the initial ballistic jet propagation in a surrounding cavity followed by a sudden deceleration in the interstellar medium under the assumption of its standard density of $\sim$1 cm$^{-3}$. Such densities are likely in the surrounding of this source give…

7. Close Not relevant

   Evidence for low power radio jet-ISM interaction at 10 parsec in the dwarf AGN host NGC 4395

   Payel Nandi, C. S. Stalin, D. J. Saikia et al. · 2023 · 2023 ApJ 959 116 · cited 9 times · Not summarized yet

   Abstract

   Black hole driven outfBlack hole driven outflows in galaxies hosting active galactic nuclei (AGN) may interact with their interstellar medium (ISM) affecting star formation. Such feedback processes, reminiscent of those seen in massive galaxies, have been reported recently in some dwarf galaxies. However, such studies have usually been on kiloparsec and larger scales and our knowledge on the smallest spatial scales to which this feedback processes can operate is unclear. Here we demonstrate radio jet-ISM interaction on the scale of an asymmetric triple radio structure of $\sim$10 parsec size in NGC 4395. This triplet radio structure is seen in the 15 GHz continuum image and the two asymmetri…

8. Close Not relevant

   First Sagittarius A* Event Horizon Telescope Results. VI: Testing the Black Hole Metric

   The Event Horizon Telescope Collaboration · 2023 · The Astrophysical Journal Letters, Volume 930, Number 2, id L17, 44pp., 2022 May 12 · cited 672 times · Not summarized yet

   Abstract

   Astrophysical black holes are expected to be described by the Kerr metric. This is the only stationary, vacuum, axisymmetric metric, without electromagnetic charge, that satisfies Einstein's equations and does not have pathologies outside of the event horizon. We present new constraints on potential deviations from the Kerr prediction based on 2017 EHT observations of Sagittarius A* (Sgr A*). We calibrate the relationship between the geometrically defined black hole shadow and the observed size of the ring-like images using a library that includes both Kerr and non-Kerr simulations. We use the exquisite prior constraints on the mass-to-distance ratio for Sgr A* to show that the observed imag…