X-ray reflection spectroscopy with improved calculations of the emission angle
arXiv:2506.00946 · doi:10.3847/1538-4357/adf111
Abstract
The reflection spectrum produced by a cold medium illuminated by X-ray photons is not isotropic and its shape depends on the emission angle. In the reflection spectrum of an accretion disk of a black hole, the value of the emission angle changes over the disk and, in general, is different from the value of the inclination angle of the disk because of the light bending in the strong gravitational field of the black hole. Current reflection models make some approximations, as calculating a reflection spectrum taking the correct emission angle at every point of the disk into account would be too time-consuming and make the model too slow to analyze observations. In a recent paper, we showed that these approximations are unsuitable to fit high-quality black hole spectra expected from the next generation of X-ray missions. Here, we present a reflection model with improved calculations of the emission angle that solves this problem.
13 pages, 5 figures. v2: refereed version. v3: fixed a typo. Accepted for publication in ApJ
References in corpus (33)
- On the Absorption of X-rays in the Interstellar Medium
- X-ray Properties of Black-Hole Binaries
- Atomic Data for Astrophysics. II. New Analytic Fits for Photoionization Cross Sections of Atoms and Ions
- Improved Reflection Models of Black-Hole Accretion Disks: Treating the Angular Distribution of X-rays
- Constraining Black Hole Spin Via X-ray Spectroscopy
- Measuring Black Hole Spin using X-ray Reflection Spectroscopy
- X-ray reflected spectra from accretion disk models. I. Constant density atmospheres
- Broad emission lines for negatively spinning black holes
- Testing black hole candidates with electromagnetic radiation
- An extended scheme for fitting X-ray data with accretion disk spectra in the strong gravity regime
- The lack of variability of the iron line in MCG-6-30-15: general relativistic effects
- eXTP -- enhanced X-ray Timing and Polarimetry Mission
- Testing the Kerr black hole hypothesis using X-ray reflection spectroscopy
- Towards precision measurements of accreting black holes using X-ray reflection spectroscopy
- Determination of the X-ray reflection emissivity profile of 1H 0707-495
- A public relativistic transfer function model for X-ray reverberation mapping of accreting black holes
- Testing general relativity with the reflection spectrum of the supermassive black hole in 1H0707495
- Towards precision tests of general relativity with black hole X-ray reflection spectroscopy
- Public Release of RELXILL_NK: A Relativistic Reflection Model for Testing Einstein's Gravity
- Testing the Kerr black hole hypothesis using X-ray reflection spectroscopy and a thin disk model with finite thickness
- Testing General Relativity with NuSTAR data of Galactic Black Holes
- A New Spin on an Old Black Hole: NuSTAR Spectroscopy of EXO 1846-031
- A study of the strong gravity region of the black hole in GS 1354-645
- Tests of the Kerr hypothesis with GRS 1915+105 using different RELXILL flavors
- 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
- The view of AGN-host alignment via reflection spectroscopy
- Implementation of a radial disk ionization profile in the RELXILL_NK model
- Reflection spectra of accretion disks illuminated by disk-like coronae
- Impact of the disk thickness on X-ray reflection spectroscopy measurements
- Impact of the reflection model on the estimate of the properties of accreting black holes
- Impact of reflection Comptonization on X-ray reflection spectroscopy: the case of EXO 1846-031
- About the accuracy of the relxill/relxill_nk models in view of the next generation of X-ray missions