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The Broad-band X-Ray Spectrum of IC 4329A from a Joint NuSTAR/Suzaku Observation

Brenneman, L. W. and Madejski, G. and Fuerst, F. and Matt, G. and Elvis, M. and Harrison, F. A. and Ballantyne, D. R. and Boggs, S. E. and Christensen, F. E. and Craig, W. W. and Fabian, A. C. and Grefenstette, B. W. and Hailey, C. J. and Madsen, K. K. and Marinucci, A. and Rivers, E. and Stern, D. and Walton, D. J. and Zhang, W. W. (2014) The Broad-band X-Ray Spectrum of IC 4329A from a Joint NuSTAR/Suzaku Observation. Astrophysical Journal, 788 (1). Art. No. 61. ISSN 0004-637X. doi:10.1088/0004-637X/788/1/61.

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We have obtained a deep, simultaneous observation of the bright, nearby Seyfert galaxy IC 4329A with Suzaku and NuSTAR. Through a detailed spectral analysis, we are able to robustly separate the continuum, absorption, and distant reflection components in the spectrum. The absorbing column is found to be modest (~6 X 10^(21) cm^(-2)), and does not introduce any significant curvature in the Fe K band. We are able to place a strong constraint on the presence of a broadened Fe Kα line (E_(rest) = 6.46^(+0.08)_(-0.07) keV with σ = 0.33^(0.08)_(-0.07) keV and EW = 34^(+8)_(-7) eV), though we are not able to constrain any of the parameters of a relativistic reflection model. These results highlight the range in broad Fe K line strengths observed in nearby, bright, active galactic nuclei (roughly an order of magnitude), and imply a corresponding range in the physical properties of the inner accretion disk in these sources. We have also updated our previously reported measurement of the high-energy cutoff of the hard X-ray emission using both observatories rather than just NuSTAR alone: E _(cut) = 186 ± 14 keV. This high-energy cutoff acts as a proxy for the temperature of the coronal electron plasma, enabling us to further separate this parameter from the plasma's optical depth and to update our results for these parameters as well. We derive kT = 50^(+6)_(-3) keV with τ = 2.34^(0.16)_(-0.11) using a spherical geometry, kT = 61 ± 1 keV with τ = 0.68 ± 0.02 for a slab geometry, with both having an equivalent goodness-of-fit.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Fuerst, F.0000-0003-0388-0560
Matt, G.0000-0002-2152-0916
Harrison, F. A.0000-0003-2992-8024
Ballantyne, D. R.0000-0001-8128-6976
Boggs, S. E.0000-0001-9567-4224
Christensen, F. E.0000-0001-5679-1946
Fabian, A. C.0000-0002-9378-4072
Grefenstette, B. W.0000-0002-1984-2932
Madsen, K. K.0000-0003-1252-4891
Stern, D.0000-0003-2686-9241
Walton, D. J.0000-0001-5819-3552
Zhang, W. W.0000-0002-1426-9698
Additional Information:© 2014 The American Astronomical Society. Received 2014 February 28; accepted 2014 April 25; published 2014 May 21. This work was supported under NASA Contract No. NNG08FD60C and 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. We thank the NuSTAR Operations, Software, and Calibration teams for support with the execution and analysis of these observations. This research has made use of the NuSTAR Data Analysis Software (NuSTARDAS) jointly developed by theASI Science Data Center (ASDC, Italy) and the California Institute of Technology (USA). L.B. thanks Koji Mukai and the Suzaku GOF at NASA/GSFC for all their assistance in obtaining and analyzing that data, and also gratefully acknowledges funding from NASA grant NNX13AE90G. G. Matt and A.M. acknowledge financial support from Italian Space Agency under contract ASI/INAF I/037/12/0-011/13.
Group:NuSTAR, Space Radiation Laboratory
Funding AgencyGrant Number
Agenzia Spaziale Italiana (ASI)I/037/12/0-011/13
Subject Keywords:accretion; accretion disks; galaxies : active; galaxies : individual (IC 4329A); galaxies : nuclei; galaxies : Seyfert; X-rays : galaxies
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2014-53
Issue or Number:1
Record Number:CaltechAUTHORS:20140703-122140957
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Official Citation:The Broad-band X-Ray Spectrum of IC 4329A from a Joint NuSTAR/Suzaku Observation L. W. Brenneman et al. 2014 ApJ 788 61
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46816
Deposited On:07 Jul 2014 16:42
Last Modified:10 Nov 2021 17:29

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