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The X-Ray Reflection Spectrum of the Radio-loud Quasar 4C 74.26

Lohfink, Anne M. and Fabian, Andrew C. and Ballantyne, David R. and Boggs, S. E. and Boorman, Peter and Christensen, F. E. and Craig, W. W. and Farrah, Duncan and García, Javier and Hailey, C. J. and Harrison, F. A. and Ricci, Claudio and Stern, Daniel and Zhang, W. W. (2017) The X-Ray Reflection Spectrum of the Radio-loud Quasar 4C 74.26. Astrophysical Journal, 841 (2). Art. No. 80. ISSN 1538-4357.

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The relativistic jets created by some active galactic nuclei are important agents of AGN feedback. In spite of this, our understanding of what produces these jets is still incomplete. X-ray observations, which can probe the processes operating in the central regions in the immediate vicinity of the supermassive black hole, the presumed jet launching point, are potentially particularly valuable in illuminating the jet formation process. Here, we present the hard X-ray NuSTAR observations of the radio-loud quasar 4C 74.26 in a joint analysis with quasi-simultaneous, soft X-ray Swift observations. Our spectral analysis reveals a high-energy cutoff of 183^(+51)_(-35) keV and confirms the presence of ionized reflection in the source. From the average spectrum we detect that the accretion disk is mildly recessed, with an inner radius of R_(in) = 4–180 R_g. However, no significant evolution of the inner radius is seen during the three months covered by our NuSTAR campaign. This lack of variation could mean that the jet formation in this radio-loud quasar differs from what is observed in broad-line radio galaxies.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Fabian, Andrew C.0000-0002-9378-4072
Ballantyne, David R.0000-0001-8128-6976
Boggs, S. E.0000-0001-9567-4224
Boorman, Peter0000-0001-9379-4716
Christensen, F. E.0000-0001-5679-1946
Farrah, Duncan0000-0003-1748-2010
García, Javier0000-0003-3828-2448
Harrison, F. A.0000-0003-2992-8024
Ricci, Claudio0000-0001-5231-2645
Stern, Daniel0000-0003-2686-9241
Zhang, W. W.0000-0002-1426-9698
Additional Information:© 2017 The American Astronomical Society. Received 2017 January 2; revised 2017 April 3; accepted 2017 April 10; published 2017 May 26. The authors thank the referee for the useful comments that have helped to improve the manuscript. A.L. acknowledges support from the ERC Advanced Grant FEEDBACK 340442 and useful discussions with Niel Brandt. J.A.G. acknowledges partial funding provided by the Alexander von Humboldt Foundation. This work made use of data supplied by the UK Swift Science Data Centre at the University of Leicester. This work has made use of data from the NuSTAR mission, a project led by the California Institute of Technology, managed by the Jet Propulsion Laboratory and funded by the National Aeronautics and Space Administration. This research has made use of the NuSTAR Data Analysis Software (NuSTARDAS) jointly developed by the ASI Science Data Center (ASDC, Italy) and the California Institute of Technology (USA).
Group:Space Radiation Laboratory, NuSTAR, Astronomy Department
Funding AgencyGrant Number
European Research Council (ERC)340442
Alexander von Humboldt FoundationUNSPECIFIED
Subject Keywords:black hole physics – galaxies: active – quasars: individual (4C 74.26) – quasars: supermassive black holes – X-rays: individual (4C 74.26)
Issue or Number:2
Record Number:CaltechAUTHORS:20170531-110427362
Persistent URL:
Official Citation:Anne M. Lohfink et al 2017 ApJ 841 80
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:77857
Deposited By: Tony Diaz
Deposited On:31 May 2017 18:17
Last Modified:09 Mar 2020 13:19

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