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The soft-X-ray emission of Ark 120. XMM–Newton, NuSTAR, and the importance of taking the broad view

Matt, G. and Marinucci, A. and Guainazzi, M. and Brenneman, L. W. and Elvis, M. and Lohfink, A. and Arèvalo, P. and Boggs, S. E. and Cappi, M. and Christensen, F. E. and Craig, W. W. and Fabian, A. C. and Fuerst, F. and Hailey, C. J. and Harrison, F. A. and Parker, M. and Reynolds, C. S. and Stern, D. and Walton, D. J. and Zhang, W. W. (2014) The soft-X-ray emission of Ark 120. XMM–Newton, NuSTAR, and the importance of taking the broad view. Monthly Notices of the Royal Astronomical Society, 439 (3). pp. 3016-3021. ISSN 0035-8711. doi:10.1093/mnras/stu159.

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We present simultaneous XMM–Newton and NuSTAR observations of the ‘bare’ Seyfert 1 galaxy, Ark 120, a system in which ionized absorption is absent. The NuSTAR hard-X-ray spectral coverage allows us to constrain different models for the excess soft-X-ray emission. Among phenomenological models, a cutoff power law best explains the soft-X-ray emission. This model likely corresponds to Comptonization of the accretion disc seed UV photons by a population of warm electrons: using Comptonization models, a temperature of ∼0.3 keV and an optical depth of ∼13 are found. If the UV-to-X-ray OPTXAGNF model is applied, the UV fluxes from the XMM–Newton Optical Monitor suggest an intermediate black hole spin. Contrary to several other sources observed by NuSTAR, no high-energy cutoff is detected with a lower limit of 190 keV.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Matt, G.0000-0002-2152-0916
Boggs, S. E.0000-0001-9567-4224
Christensen, F. E.0000-0001-5679-1946
Fabian, A. C.0000-0002-9378-4072
Fuerst, F.0000-0003-0388-0560
Harrison, F. A.0000-0003-2992-8024
Stern, D.0000-0003-2686-9241
Walton, D. J.0000-0001-5819-3552
Zhang, W. W.0000-0002-1426-9698
Additional Information:© 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. First published online: February 18, 2014. We thank the anonymous referee for useful comments which helped us to improve the clarity of the paper, and Chris Done for comments and advices on the OPTXAGNF model. 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. 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 NUSTARDAS jointly developed by the ASI Science Data Center (ASDC, Italy) and the California Institute of Technology (USA). The work is also based on observations obtained with XMM–Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and the USA (NASA). GM and AM acknowledge financial support from Italian Space Agency under grant ASI/INAF I/037/12/0-011/13 and from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement n.312789.
Group:NuSTAR, Space Radiation Laboratory
Funding AgencyGrant Number
Agenzia Spaziale Italiana (ASI)ASI/INAF I/037/12/0-011/13
European Research Council (ERC)312789
Istituto Nazionale di Astrofisica (INAF)UNSPECIFIED
Subject Keywords:accretion, accretion discs galaxies: active galaxies: individual: Ark 120
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2014-58
Issue or Number:3
Record Number:CaltechAUTHORS:20140530-140105315
Persistent URL:
Official Citation:G. Matt, A. Marinucci, M. Guainazzi, L. W. Brenneman, M. Elvis, A. Lohfink, P. Arèvalo, S. E. Boggs, M. Cappi, F. E. Christensen, W. W. Craig, A. C. Fabian, F. Fuerst, C. J. Hailey, F. A. Harrison, M. Parker, C. S. Reynolds, D. Stern, D. J. Walton, and W. W. Zhang The soft-X-ray emission of Ark 120. XMM–Newton, NuSTAR, and the importance of taking the broad view MNRAS (April 11, 2014) Vol. 439 3016-3021 first published online February 18, 2014 doi:10.1093/mnras/stu159
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46013
Deposited By: Ruth Sustaita
Deposited On:30 May 2014 21:22
Last Modified:10 Nov 2021 17:19

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