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Multi-wavelength campaign on NGC 7469. IV. The broad-band X-ray spectrum

Middei, R. and Bianchi, S. and Cappi, M. and Petrucci, P.-O. and Ursini, F. and Arav, N. and Behar, E. and Branduardi-Raymont, G. and Costantini, E. and De Marco, B. and Di Gesu, L. and Ebrero, J. and Kaastra, J. and Kaspi, S. and Kriss, G. A. and Mao, J. and Mehdipour, M. and Paltani, S. and Peretz, U. and Ponti, G. (2018) Multi-wavelength campaign on NGC 7469. IV. The broad-band X-ray spectrum. Astronomy and Astrophysics, 615 . Art. No. A163. ISSN 0004-6361. https://resolver.caltech.edu/CaltechAUTHORS:20180325-184643880

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Abstract

We conducted a multi-wavelength 6-month campaign to observe the Seyfert Galaxy NGC 7469, using the space-based observatories HST, Swift, XMM-Newton and NuSTAR. We report the results of the spectral analysis of the seven simultaneous XMM-Newton and NuSTAR observations. The source shows significant flux variability within each observation, but the average flux is less variable among the different pointings of our campaign. Our spectral analysis reveals a prominent narrow neutral Fe Kαemission line in all the spectra and weaker contributions from Fe Kβ, neutral Ni Kα, and ionized iron. We find no evidence for variability or relativistic effects acting on the emission lines, which indicates that they originate from distant material. In the joint analysis of XMM-Newton and NuSTAR data, a constant photon index is found (Γ = 1.78 ± 0.02) together with a high energy cut-off E_(cut) = 170_(−40)^(+60) keV. Adopting a self-consistent Comptonization model, these values correspond to an average coronal electron temperature of kT = 45_(−12)^(+15) keV and, assuming a spherical geometry, an optical depth τ = 2.6 ± 0.9. The reflection component is consistent with being constant and the reflection fraction is in the range R = 0.3−0.6. A prominent soft excess dominates the spectra below 4 keV. This is best fit with a second Comptonization component, arising from a warm corona with an average kT = 0.67 ± 0.03 keV and a corresponding optical depth τ = 9.2 ± 0.2.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1051/0004-6361/201832726DOIArticle
http://arxiv.org/abs/1803.07334arXivDiscussion Paper
ORCID:
AuthorORCID
Middei, R.0000-0001-9815-9092
Paltani, S.0000-0002-8108-9179
Alternate Title:Multi-wavelength campaign on NGC 7469 IV. The broad-band X-ray spectrum
Additional Information:© 2018 ESO. Article published by EDP Sciences. Received: 29 January 2018; Accepted: 19 March 2018. Published online 01 August 2018. We thank the referee for helping us improve the quality of this paper. 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). RM and SB acknowledge financial support from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement no. 312789. SB acknowledges financial support from the Italian Space Agency under grant ASI-INAF I/037/12/0. POP acknowledges financial support from the CNES french agency and the CNRS PNHE. GP acknowledges support by the Bundesministerium fü r Wirtschaft und Technologie/Deutsches Zentrum für Luftund Raumfahrt (BMWI/DLR, FKZ 50 OR 1408) and the Max Planck Society. SRON is supported financially by NWO, the Netherlands Organization for Scientific Research.BDM acknowledges support from the Polish National Science Center grant Polonez 2016/21/P/ST9/04025. The research at the Technion is supported by the I-CORE programme of the Planning and Budgeting Committee (grant number 1937/12). EB acknowledges funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska–Curie grant agreement no. 655324. M.C. acknowledges financial contribution from the agreement ASI-INAF n.2017-14-H.O.
Group:NuSTAR
Subject Keywords:galaxies: active – quasars: general – X-rays: galaxies
Record Number:CaltechAUTHORS:20180325-184643880
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180325-184643880
Official Citation:Multi-wavelength campaign on NCG 7469 - IV. The broad-band X-ray spectrum R. Middei, S. Bianchi, M. Cappi, P.-O. Petrucci, F. Ursini, N. Arav, E. Behar, G. Branduardi-Raymont, E. Costantini, B. De Marco, L. Di Gesu, J. Ebrero, J. Kaastra, S. Kaspi, G. A. Kriss, J. Mao, M. Mehdipour, S. Paltani, U. Peretz and G. Ponti A&A, 615 (2018) A163 DOI: https://doi.org/10.1051/0004-6361/201832726
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:85430
Collection:CaltechAUTHORS
Deposited By: Joy Painter
Deposited On:26 Mar 2018 20:03
Last Modified:03 Oct 2019 19:31

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