Measuring black hole spins with x-ray reflection spectroscopy: A GRMHD outlook
arXiv:2507.02583 · doi:10.1103/4sth-rnwv
Abstract
X-ray reflection spectroscopy has evolved as one of the leading methods to measure black hole spins. However, the question is whether its measurements are subjected to systematic biases, especially considering the possible discrepancy between the spin measurements inferred with this technique and those from gravitational wave observations. In this work, we use general relativistic magnetohydrodynamic (GRMHD) simulations of thin accretion disks around spinning black holes for modeling the accretion process, and then we simulate NuSTAR observations to test the capability of modern reflection models in recovering the input spins. For the first time, we model the electron density and ionization profiles from GRMHD-simulated disks. Our study reveals that current reflection models work well only for fast-rotating black holes. We model the corona as the base of the jet and we find that reflection models with lamppost emissivity profiles fail to recover the correct black hole spins. Reflection models with broken power-law emissivity profiles perform better. As we increase the complexity of the simulated models, it is more difficult to recover the correct input spins, pointing toward the need to update our current reflection models with more advanced accretion disks and coronal geometries.
21 pages, 12 figures. v2: refereed version. Supplemental material available at http://link.aps.org/supplemental/10.1103/4sth-rnwv
References in corpus (50)
- GWTC-2: Compact Binary Coalescences Observed by LIGO and Virgo During the First Half of the Third Observing Run
- GWTC-3: Compact Binary Coalescences Observed by LIGO and Virgo During the Second Part of the Third Observing Run
- The Supernova -- Gamma-Ray Burst Connection
- First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring
- An XMM-Newton survey of broad iron lines in Seyfert galaxies
- The Athena++ Adaptive Mesh Refinement Framework: Design and Magnetohydrodynamic Solvers
- First Sagittarius A* Event Horizon Telescope Results. V. Testing Astrophysical Models of the Galactic Center Black Hole
- Broad iron K-alpha emission lines as a diagnostic of black hole spin
- MHD simulations of jet acceleration from Keplerian accretion disks: the effects of disk resistivity
- Towards precision measurements of accreting black holes using X-ray reflection spectroscopy
- Accretion Discs with Strong Toroidal Magnetic Fields
- The Origin of Black Hole Spin in Galactic Low-Mass X-ray Binaries
- A public relativistic transfer function model for X-ray reverberation mapping of accreting black holes
- Broadband Multi-wavelength Properties of M87 during the 2017 Event Horizon Telescope Campaign
- Formation of Magnetically Truncated Accretion Disks in 3D Radiation-Transport Two-Temperature GRMHD Simulations
- Insight-HXMT observations of jet-like corona in a black hole X-ray binary MAXI J1820+070
- Public Release of RELXILL_NK: A Relativistic Reflection Model for Testing Einstein's Gravity
- Apples and Oranges: Comparing black holes in X-ray binaries and gravitational-wave sources
- Accretion Geometry in the Hard State of the Black-Hole X-Ray Binary MAXI J1820+070
- Puffy accretion disks: sub-Eddington, optically thick, and stable
- The Effect of Returning Radiation on Relativistic Reflection
- Gravitational Wave Astronomy With TianQin
- Testing General Relativity with NuSTAR data of Galactic Black Holes
- Reflection Modeling of the Black Hole Binary 4U~163047: the Disk Density and Returning Radiation
- Jets, disc-winds and oscillations in general relativistic, magnetically driven flows around black hole
- Systematically Revisiting All NuSTAR Spins of Black Holes in X-Ray Binaries
- Modelling correlated variability in accreting black holes: the effect of high density and variable ionisation on reverberation lags
- GRMHD Simulations and Modeling for Jet Formation and Acceleration Region in AGNs
- Observational properties of puffy disks: radiative GRMHD spectra of mildly sub-Eddington accretion
- Hybrid Comptonization and Electron-Positron Pair Production in the Black-Hole X-Ray Binary MAXI J1820+070
- Implementation of a radial disk ionization profile in the RELXILL_NK model
- Spin and Accretion Rate Dependence of Black Hole X-Ray Spectra
- Modeling uncertainties in X-ray reflection spectroscopy measurements II: Impact of the radiation from the plunging region
- Black hole Spin Measurement Based on Time-domain VLBI Observations of Infalling Gas Cloud
- Reflection spectra of accretion disks illuminated by disk-like coronae
- Phase-resolved spectroscopic analysis of the eclipsing black hole X-ray binary M33 X-7: System properties, accretion, and evolution
- Modeling uncertainties in X-ray reflection spectroscopy measurements I: Impact of higher order disk images
- High-density reflection spectroscopy of black hole X-ray binaries in the hard state
- Testing relativistic reflection models with GRMHD simulations of accreting black holes
- X-ray spectra of black hole X-ray binaries with returning radiation
- Comprehensive UV and Optical spectral analysis of Cygnus X-1: Stellar and wind parameters, abundances, and evolutionary implications
- Towards more accurate synthetic reflection spectra: improving the calculations of returning radiation
- Truncated accretion discs in black hole X-ray binaries: dynamics and variability signatures
- Testing the Keplerian disk hypothesis using X-ray reflection spectroscopy
- Modeling Multiple X-Ray Reflection in Super-Eddington Winds
- The 2018 outburst of MAXI J1820+070 as seen by Insight-HXMT
- Spectra of Puffy Accretion Discs: the kynbb Fit
- About the accuracy of the relxill/relxill_nk models in view of the next generation of X-ray missions
- Reflection Spectra of Accretion Disks Illuminated by an Off-Axis Corona
- X-ray reflection spectroscopy with improved calculations of the emission angle