A full characterization of the supermassive black hole in IRAS09149-6206
Walton DJ, Alston WN, Kosec P, Fabian AC, Gallo LC, Garcia JA, Miller JM, Nardini E, Reynolds MT, Ricci C, Stern D, Dauser T, Harrison FA, Reynolds CS (2020)
Publication Type: Journal article
Publication year: 2020
Journal
Book Volume: 499
Pages Range: 1480-1498
Journal Issue: 1
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 (1s uncertainties). This is in good agreement with previous estimates based on the Ha and Hβ 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.
Authors with CRIS profile
Involved external institutions
University of Cambridge
United Kingdom (GB)
Saint Mary's University
Canada (CA)
California Institute of Technology (Caltech)
United States (USA) (US)
University of Michigan
United States (USA) (US)
Università degli Studi di Firenze / University of Florence
Italy (IT)
Diego Portales University / Universidad Diego Portales
Chile (CL)
United Kingdom (GB)
Saint Mary's University
Canada (CA)
California Institute of Technology (Caltech)
United States (USA) (US)
University of Michigan
United States (USA) (US)
Università degli Studi di Firenze / University of Florence
Italy (IT)
Diego Portales University / Universidad Diego Portales
Chile (CL)
How to cite
APA:
Walton, D.J., Alston, W.N., Kosec, P., Fabian, A.C., Gallo, L.C., Garcia, J.A.,... Reynolds, C.S. (2020). A full characterization of the supermassive black hole in IRAS09149-6206. Monthly Notices of the Royal Astronomical Society, 499(1), 1480-1498. https://doi.org/10.1093/mnras/staa2961
MLA:
Walton, D. J., et al. "A full characterization of the supermassive black hole in IRAS09149-6206." Monthly Notices of the Royal Astronomical Society 499.1 (2020): 1480-1498.
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