Evidence for a moderate spin from X-ray reflection of the high-mass supermassive black hole in the cluster-hosted quasar H1821+643

Abstract

We present an analysis of deep $Chandra$ Low-Energy and High-Energy Transmission Grating archival observations of the extraordinarily luminous radio-quiet quasar H1821+643, hosted by a rich and massive cool-core cluster at redshift $z=0.3$. These datasets provide high-resolution spectra of the AGN at two epochs, free from contamination by the intracluster medium and from the effects of photon pile-up, providing a sensitive probe of the iron-$K$ band. At both epochs, the spectrum is well described by a power-law continuum plus X-ray reflection from both the inner accretion disc and cold, slowly-moving distant matter. Adopting this framework, we proceed to examine the properties of the inner disc and the black hole spin. Using Markov chain Monte Carlo (MCMC) methods, we combine constraints from the two epochs assuming that the black hole spin, inner disc inclination, and inner disc iron abundance are invariant. The black hole spin is found to be modest, with a 90$\%$ credible range of $a^{\ast }=0.62_{-0.37}^{+0.22}$; and, with a mass $M_{\mathrm{BH}}$ in the range $\log (M_{\mathrm{BH}}/M_{\odot })\sim 9.2-10.5$, this is the most massive black hole candidate for which a well-defined spin constraint has yet been obtained. The modest spin of this black hole supports previous suggestions that the most massive black holes may grow via incoherent or chaotic accretion and/or SMBH-SMBH mergers.

arXiv comment13 pages, 8 figures, 3 tables. Accepted for publication in MNRAS. Amended to include two missing references

References in corpus (47)

• Astropy: A Community Python Package for Astronomy
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• On the Absorption of X-rays in the Interstellar Medium
• Observational Evidence of AGN Feedback
• HI4PI: A full-sky HI survey based on EBHIS and GASS
• AGN Black Hole Masses and Bolometric Luminosities
• Improved Reflection Models of Black-Hole Accretion Disks: Treating the Angular Distribution of X-rays
• Planck 2013 results. XXIX. Planck catalogue of Sunyaev-Zeldovich sources
• X-ray Spectra of a large sample of Quasars with ASCA
• The role of the reflection fraction in constraining black hole spin
• The distribution and cosmic evolution of massive black hole spins
• Observational Constraints on Black Hole Spin
• On the use of C-stat in testing models for X-ray spectra
• X-ray Reflection By Photoionized Accretion Discs
• Normalizing a Relativistic Model of X-ray Reflection: The Definition of the Reflection Fraction and its Implementation in relxill
• Linking the spin evolution of massive black holes to galaxy kinematics
• X-ray cavities in a sample of 83 SPT-selected clusters of galaxies: Tracing the evolution of AGN feedback in clusters of galaxies out to z=1.2
• Towards precision measurements of accreting black holes using X-ray reflection spectroscopy
• The host galaxies of luminous quasars
• Revisiting the Cooling Flow Problem in Galaxies, Groups, and Clusters of Galaxies
• High Density Reflection Spectroscopy: II. the Density of the Inner Black Hole Accretion Disc in AGN
• A Suzaku survey of Fe K lines in Seyfert 1 AGN
• The optically-powerful quasar E1821+643 is associated with a 300-kpc scale FRI radio structure
• Tracing the Warm-Hot Intergalactic Medium at Low Redshift: X-ray Forest Observations Towards H1821+643
• Multi-dimensional modelling of X-ray spectra for AGN accretion-disk outflows
• New constraints on light Axion-Like Particles using Chandra Transmission Grating Spectroscopy of the powerful cluster-hosted quasar H1821+643
• The Origin of the Intrinsic Scatter in the Relation Between Black Hole Mass and Bulge Luminosity for Nearby Active Galaxies
• A giant radio halo in the cool core cluster CL1821+643
• FUSE Observations of the Galactic and Intergalactic Medium Towards H1821+643
• Spin evolution and feedback of supermassive black holes in cosmological simulations
• Multi-dimensional modelling of X-ray spectra for AGN accretion-disk outflows II
• The X-ray luminous cluster underlying the bright radio-quiet quasar H1821+643
• Detection of the Missing Baryons toward the Sightline of H1821+643
• The effect of the quasar H1821+643 on the surrounding intracluster medium: revealing the underlying cooling flow
• First long-term optical spectro-photometric monitoring of a binary black hole candidate E1821+643: I. Variability of spectral lines and continuum
• A Chandra HETG Observation of the Quasar H 1821+643 and Its Surrounding Cluster
• A high velocity component to the complex absorption in IRAS 13349+2438
• On Constraining the Growth History of Massive Black Holes via Their Distribution on the Spin-Mass Plane
• The X-ray Disk/Wind Degeneracy in AGN
• The X-ray spectrum of the cooling-flow quasar H1821+643 : A massive black hole feeding off the intracluster medium
• How unusual is the cool-core radio halo cluster CL1821+643 ?
• The X-ray reflection spectrum of the radio-loud quasar 4C 74.26
• Extreme Relativistic Reflection in the Active Galaxy ESO 033-G002
• A Comparison of Two Methods for Estimating Black Hole Spin in Active Galactic Nuclei
• Detection of a possible multiphase ultra-fast outflow in IRAS 13349+2438 with NuSTAR and XMM-Newton
• Lyman alpha absorption in the nearby universe: the sightline to Q1821+643
• XMM-Newton view of the double-peaked Fe K-alpha complex in E1821+643