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Title:
Anatomy of the AGN in NGC 5548. I. A global model for the broadband spectral energy distribution
Authors:
Mehdipour, M.; Kaastra, J. S.; Kriss, G. A.; Cappi, M.; Petrucci, P.-O.; Steenbrugge, K. C.; Arav, N.; Behar, E.; Bianchi, S.; Boissay, R.; Branduardi-Raymont, G.; Costantini, E.; Ebrero, J.; Di Gesu, L.; Harrison, F. A.; Kaspi, S.; De Marco, B.; Matt, G.; Paltani, S.; Peterson, B. M.; Ponti, G.; Pozo Nuñez, F.; De Rosa, A.; Ursini, F.; de Vries, C. P.; Walton, D. J.; Whewell, M.
Affiliation:
AA(SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA, Utrecht, The Netherlands ; Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK), AB(SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA, Utrecht, The Netherlands ; Department of Physics and Astronomy, Universiteit Utrecht, PO Box 80000, 3508 TA, Utrecht, The Netherlands; Leiden Observatory, Leiden University, PO Box 9513, 2300 RA, Leiden, The Netherlands), AC(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD, 21218, USA; Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD, 21218, USA), AD(INAF-IASF Bologna, via Gobetti 101, 40129, Bologna, Italy), AE(University Grenoble Alpes, IPAG, 38000, Grenoble, France; CNRS, IPAG, 38000, Grenoble, France), AF(Instituto de Astronomía, Universidad Católica del Norte, Avenida Angamos 0610, Casilla 1280, Antofagasta, Chile; Department of Physics, University of Oxford, Keble Road, Oxford, OX1 3RH, UK), AG(Department of Physics, Virginia Tech, Blacksburg, VA, 24061, USA), AH(Department of Physics, Technion-Israel Institute of Technology, 32000, Haifa, Israel), AI(Dipartimento di Matematica e Fisica, Università degli Studi Roma Tre, via della Vasca Navale 84, 00146, Roma, Italy), AJ(Department of Astronomy, University of Geneva, 16 Ch. d'Ecogia, 1290, Versoix, Switzerland), AK(Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK), AL(SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA, Utrecht, The Netherlands ), AM(European Space Astronomy Centre, PO Box 78, 28691, Villanueva de la Cañada, Madrid, Spain; SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA, Utrecht, The Netherlands ), AN(SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA, Utrecht, The Netherlands ), AO(Cahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA, 91125, USA), AP(Department of Physics, Technion-Israel Institute of Technology, 32000, Haifa, Israel), AQ(Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, 85748, Garching, Germany), AR(Dipartimento di Matematica e Fisica, Università degli Studi Roma Tre, via della Vasca Navale 84, 00146, Roma, Italy), AS(Department of Astronomy, University of Geneva, 16 Ch. d'Ecogia, 1290, Versoix, Switzerland), AT(Department of Astronomy, The Ohio State University, 140 W 18th Avenue, Columbus, OH, 43210, USA; Center for Cosmology & AstroParticle Physics, The Ohio State University, 191 West Woodruff Ave., Columbus, OH, 43210, USA), AU(Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, 85748, Garching, Germany), AV(Astronomisches Institut, Ruhr-Universität Bochum, Universitätsstraße 150, 44801, Bochum, Germany), AW(INAF/IAPS, via Fosso del Cavaliere 100, 00133, Roma, Italy), AX(University Grenoble Alpes, IPAG, 38000, Grenoble, France; CNRS, IPAG, 38000, Grenoble, France), AY(SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA, Utrecht, The Netherlands ), AZ(Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA, 91109, USA; Cahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA, 91125, USA), BA(Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK)
Publication:
Astronomy & Astrophysics, Volume 575, id.A22, 18 pp. (A&A Homepage)
Publication Date:
03/2015
Origin:
EDP Sciences
Astronomy Keywords:
X-rays: galaxies, galaxies: active, galaxies:, Seyfert, galaxies: individual: NGC 5548, techniques: spectroscopic
DOI:
10.1051/0004-6361/201425373
Bibliographic Code:
2015A&A...575A..22M

Abstract

An extensive multi-satellite campaign on NGC 5548 has revealed this archetypal Seyfert-1 galaxy to be in an exceptional state of persistent heavy absorption. Our observations taken in 2013-2014 with XMM-Newton, Swift, NuSTAR, INTEGRAL, Chandra, HST and two ground-based observatories have together enabled us to establish that this unexpected phenomenon is caused by an outflowing stream of weakly ionised gas (called the obscurer), extending from the vicinity of the accretion disk to the broad-line region. In this work we present the details of our campaign and the data obtained by all the observatories. We determine the spectral energy distribution of NGC 5548 from near-infrared to hard X-rays by establishing the contribution of various emission and absorption processes taking place along our line of sight towards the central engine. We thus uncover the intrinsic emission and produce a broadband continuum model for both obscured (average summer 2013 data) and unobscured (<2011) epochs of NGC 5548. Our results suggest that the intrinsic NIR/optical/UV continuum is a single Comptonised component with its higher energy tail creating the "softX-ray excess". This component is compatible with emission from a warm, optically-thick corona as part of the inner accretion disk. We then investigate the effects of the continuum on the ionisation balance and thermal stability of photoionised gas for unobscured and obscured epochs.

Appendix A is available in electronic form at http://www.aanda.org


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