A full characterization of the supermassive black hole in IRAS 09149–6206
Abstract
We present new broad-band X-ray observations of the type-I Seyfert galaxy IRAS 09149–6206, taken in 2018 with XMM–Newton, NuSTAR, and Swift. The source is highly complex, showing a classic ‘warm’ X-ray absorber, additional absorption from highly ionized iron, strong relativistic reflection from the innermost accretion disc and further reprocessing by more distant material. By combining X-ray timing and spectroscopy, we have been able to fully characterize the supermassive black hole in this system, constraining both its mass and – for the first time – its spin. The mass is primarily determined by X-ray timing constraints on the break frequency seen in the power spectrum, and is found to be log [MBH/M⊙] = 8.0 ± 0.6 (1σ uncertainties). This is in good agreement with previous estimates based on the H α and H β line widths, and implies that IRAS 09149–6206 is radiating at close to (but still below) its Eddington luminosity. The spin is constrained via detailed modelling of the relativistic reflection, and is found to be $a^* = 0.94^{+0.02}_{-0.07}$ (90 per cent confidence), adding IRAS 09149–6206 to the growing list of radio-quiet active galactic nuclei (AGNs) that host rapidly rotating black holes. The outflow velocities of the various absorption components are all relatively modest (vout ≲ 0.03c), implying these are unlikely to drive significant galaxy-scale AGN feedback.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Oct 01, 2020
- Source ID
- 10.1093/mnras/staa2961
Entities
People
- Andrew C. Fabian
- C Ricci
- C S Reynolds
- Daniel P. Stern
- Dominic J Walton
- Emanuele Nardini
- F A Harrison
- J. A. Garcia
- James M. L. Miller
- L C Gallo
- M T Reynolds
- P Kosec
- Thomas Dauser
- William Alston
Organizations
- Alexander von Humboldt Foundation
- California Institute of Technology
- Diego Portales University
- Ecological Society of Australia
- George Mason University
- Horizon 2020
- Italian Space Agency
- National Aeronautics and Space Administration
- National Fund for Scientific and Technological Development
- National Institute for Astrophysics
- Peking University
- Saint Mary's University
- Science and Technology Facilities Council
- The Judge Advocate General's Legal Center and School
- University of Cambridge
- University of Florence
- University of Michigan