The FeK Compton shoulder in accreting Supermassive Black Holes
arXiv:2407.18312 · doi:10.1093/mnras/stae1781
Abstract
Reprocessed X-ray radiation from active galactic nuclei (AGN) carries important information about the properties of the circumnuclear material around the black hole. The X-ray photons travel from the very center of the system and interact with that material often producing strong emission lines. The FeK Compton shoulder is formed by fluorescent FeK photons that perform Compton scatterings with the intercepting material and lose energy to form the distinct shoulder shape. In this work we use the ray-tracing code RefleX to explore how the physical properties of the medium, as well as its geometry, affect the shape of the Compton shoulder (CS). We start by running simulations using a simple toroidal reflector, to test the effect of the metal composition, metallicity, column density, dust presence and velocity on the FeK line and its Compton shoulder. We confirm that the shape of the Compton shoulder is sensitive to the optical depth of the intercepting medium, which can be regulated by either changing the metal composition or the line of sight column density of the circumnuclear material. Next, we create a series of models, which feature different geometrical configurations of dust and gas, and explore how the Compton shoulder is affected by such configurations finding that components that can regulate the line-of-sight column density affect the FeK and its CS. Finally, we test whether observatories such as the recently launched XRISM and future Athena will make the Compton shoulder a useful spectral feature of nearby AGN, by applying specific models on simulated spectra of the Circinus galaxy. The CS has the potential to be used to help constrain properties of the circumnuclear material yet with some limitations.
22 pages, 19 figures, accepted by MNRAS
References in corpus (21)
- BAT AGN Spectroscopic Survey - V. X-ray properties of the Swift/BAT 70-month AGN catalog
- X-ray reverberation around accreting black holes
- Simultaneous X-ray/optical/UV snapshots of active galactic nuclei from XMM-Newton: spectral energy distributions for the reverberation mapped sample
- Cosmic X-ray Surveys of Distant Active Galaxies: The Demographics, Physics, and Ecology of Growing Supermassive Black Holes
- The close environments of accreting massive black holes are shaped by radiative feedback
- BAT AGN Spectroscopic Survey I: Spectral Measurements, Derived Quantities, and AGN Demographics
- The 2-79 keV X-ray Spectrum of the Circinus Galaxy with NuSTAR, XMM-Newton and Chandra: a Fully Compton-Thick AGN
- The Athena X-ray Integral Field Unit (X-IFU)
- Dissecting the active galactic nucleus in Circinus -- I. Peculiar mid-IR morphology explained by a dusty hollow cone
- Dissecting the active galactic nucleus in Circinus -- II. A thin dusty disc and a polar outflow on parsec scales
- Uncovering the geometry of the hot X-ray corona in the Seyfert galaxy NGC4151 with IXPE
- A dust-parallax distance of 19 megaparsecs to the supermassive black hole in NGC 4151
- BASS XXXVII: The role of radiative feedback in the growth and obscuration properties of nearby supermassive black holes
- RefleX: X-ray absorption and reflection in active galactic nuclei for arbitrary geometries
- A deep X-ray view of the bare AGN Ark120. V. Spin determination from disc-Comptonisation efficiency method
- Sensitivity of the Fe K-alpha Compton shoulder to the geometry and variability of the X-ray illumination of cosmic objects
- Reflection geometries in absorbed and unabsorbed AGN
- A multiwavelength-motivated X-ray model for the Circinus Galaxy
- Water megamaser emission in hard X-ray selected AGN
- Observations of X-ray reverberation around black holes
- The geometry of the hot corona in MCG-05-23-16 constrained by X-ray polarimetry