Polarized image of a rotating black hole surrounded by a cold dark matter halo

Abstract

We have studied the polarized image of an equatorial emitting ring around a rotating black hole surrounded by a cold dark matter (CDM) halo. Results show that the CDM halo density has the similar effects of the halo's characteristic radius on the polarized image for the black hole. The effects of the CDM halo on the polarized image depend on the magnetic field configuration, the fluid velocity and the observed inclination. With the increase of the CDM halo parameters, the observed polarization intensity decreases when the magnetic field lies in equatorial plane, but in the case where the magnetic field is perpendicular to the equatorial plane, the change of the observed polarization intensity with CDM halo also depends on the position of the emitting point in the ring. The change of the electric vector position angle (EVPA) with the CDM halo becomes more complicated. Our results also show that the influence of the CDM halo on the polarized image is generally small, which are consistent with the effects of dark matter halo on black hole shadows. These results could help to further understand dark matter from black hole images.

arXiv comment17 pages, 10 figures, Accepted for publication in EPJC

References in corpus (21)

• The Structure of Cold Dark Matter Halos
• Lensing by Kerr Black Holes
• A public code for general relativistic, polarised radiative transfer around spinning black holes
• Sagittarius A* Accretion Flow and Black Hole Parameters from General Relativistic Dynamical and Polarized Radiative Modeling
• Black Hole Space-time In Dark Matter Halo
• Black Hole Shadow of Sgr A${}^{\ast }$ in Dark Matter Halo
• Universal Polarimetric Signatures of the Black Hole Photon Ring
• Shadows of Sgr A${}^{\ast }$ Black Hole Surrounded by Superfluid Dark Matter Halo
• Inferring the Inclination of a Black Hole Accretion Disk from Observations of its Polarized Continuum Radiation
• Polarimetric Imaging of the Massive Black Hole at the Galactic Center
• Polarized Image of Equatorial Emission in the Kerr Geometry
• Probing the magnetic field structure in Sgr A* on Black Hole Horizon Scales with Polarized Radiative Transfer Simulations
• Discriminating Accretion States via Rotational Symmetry in Simulated Polarimetric Images of M87
• The impact of Faraday effects on polarized black hole images of Sagittarius A*
• Gravitational axial perturbations of Schwarzschild-like black holes in dark matter halos
• Polarized image of a rotating black hole in Scalar-Tensor-Vector-Gravity theory
• Unraveling circular polarimetric images of magnetically arrested accretion flows near event horizon of a black hole
• Predicting the X-ray polarization of type-2 Seyfert galaxies
• Image of Bonnor black dihole with a thin accretion disk and its polarization information
• Polarized image of an equatorial emitting ring around a 4D Gauss-Bonnet black hole
• General relativistic polarized radiative transfer with inverse Compton scatterings

Cited by in corpus (5)

• Black hole surrounded by the pseudo-isothermal dark matter halo
• Gravitational ringing and superradiant instabilities of the Kerr-like black holes in a dark matter halo
• The ring-shaped shadow of rotating naked singularity with a complete photon sphere
• Topological dyonic black holes of massive gravity with generalized quasitopological electromagnetism
• Probing Observable Features of Lorentz violation in Low-Energy Hořava Gravity with Accretion Disk Images of Black Hole