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Disentangling the Complex Broadband X-ray Spectrum of IRAS 13197-1627 with NuSTAR, XMM-Newton and Suzaku

Walton, D. J. and Brightman, M. and Risaliti, G. and Fabian, A. C. and Fürst, F. and Harrison, F. A. and Lohfink, A. and Matt, G. and Miniutti, G. and Parker, M. L. and Stern, D. (2018) Disentangling the Complex Broadband X-ray Spectrum of IRAS 13197-1627 with NuSTAR, XMM-Newton and Suzaku. Monthly Notices of the Royal Astronomical Society, 473 (4). pp. 4377-4391. ISSN 0035-8711. doi:10.1093/mnras/stx2659.

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We present results from a coordinated XMM–Newton+NuSTAR observation of the type 1.8 Seyfert galaxy IRAS 13197−1627. This is a highly complex source, with strong contributions from relativistic reflection from the inner accretion disc, neutral absorption and further reprocessing by more distant material, and ionized absorption from an outflow. We undertake a detailed spectral analysis combining the broad-band coverage provided by XMM–Newton+NuSTAR with a multi-epoch approach incorporating archival observations performed by XMM–Newton and Suzaku. Our focus is on characterizing the reflection from the inner accretion disc, which previous works have suggested may dominate the AGN emission, and constraining the black hole spin. Using lamppost disc reflection models, we find that the results for the inner disc are largely insensitive to assumptions regarding the geometry of the distant reprocessor and the precise form of the illuminating X-ray continuum. However, these results do depend on the treatment of the iron abundance of the distant absorber/reprocessor. The multi-epoch data favour a scenario in which the AGN is chemically homogeneous, and we find that a rapidly rotating black hole is preferred, with a* ≥ 0.7, but a slowly rotating black hole is not strongly excluded. In addition to the results for the inner disc, we also find that both the neutral and ionized absorbers vary from epoch to epoch, implying that both have some degree of inhomogeneity in their structure.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Walton, D. J.0000-0001-5819-3552
Brightman, M.0000-0002-8147-2602
Fabian, A. C.0000-0002-9378-4072
Fürst, F.0000-0003-0388-0560
Harrison, F. A.0000-0003-2992-8024
Matt, G.0000-0002-2152-0916
Parker, M. L.0000-0002-8466-7317
Stern, D.0000-0003-2686-9241
Additional Information:© 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2017 October 9. Received 2017 October 9; in original form 2017 June 7. Published: 12 October 2017. The authors would like to thank the reviewer for their helpful feedback, which helped to improve the final version of the manuscript. DJW acknowledges support from an STFC Ernest Rutherford Fellowship, and ACF acknowledges support from ERC Advanced Grant 340442. GM thanks the European Union Seventh Framework Program (FP7/2007–2013) for funding under grant 312789 (StrongGravity). This research has made use of data obtained with NuSTAR, a project led by Caltech, funded by NASA and managed by NASA/JPL, and has utilized the NUSTARDAS software package, jointly developed by the ASDC (Italy) and Caltech (USA). This research has also made use of data obtained with XMM–Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States, and with Suzaku, a collaborative mission between the space agencies of Japan (JAXA) and the USA (NASA).
Group:Space Radiation Laboratory, NuSTAR, Astronomy Department
Funding AgencyGrant Number
Science and Technology Facilities Council (STFC)UNSPECIFIED
European Research Council (ERC)340442
European Research Council (ERC)312789
Subject Keywords:black hole physics – galaxies: active – X-rays: individual: IRAS 13197−1627
Issue or Number:4
Record Number:CaltechAUTHORS:20170608-112508378
Persistent URL:
Official Citation:D. J. Walton, M. Brightman, G. Risaliti, A. C. Fabian, F. Fürst, F. A. Harrison, A. Lohfink, G. Matt, G. Miniutti, M. L. Parker, D. Stern; Disentangling the complex broad-band X-ray spectrum of IRAS 13197−1627 with NuSTAR, XMM–Newton and Suzaku, Monthly Notices of the Royal Astronomical Society, Volume 473, Issue 4, 1 February 2018, Pages 4377–4391,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78032
Deposited By: Joy Painter
Deposited On:08 Jun 2017 21:12
Last Modified:15 Nov 2021 17:36

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