Статья

Intensive disc-reverberation mapping of Fairall 9: first year of <i>Swift</i> and LCO monitoring

J V Hernández SantistebanSUPA Physics and Astronomy, University of St Andrews, Scotland KY16 9SS, UKRick EdelsonDepartment of Astronomy, University of Maryland, College Park, MD 20742-2421, USAK. HorneSUPA Physics and Astronomy, University of St Andrews, Scotland KY16 9SS, UKJ. M. GelbordEureka Scientific Inc., 2452 Delmer St, Suite 100, Oakland, CA 94602, USAAaron J. BarthDepartment of Physics and Astronomy, 4129 Frederick Reines Hall, University of California, Irvine, CA 92697, USAEdward M. CackettDepartment of Physics and Astronomy, Wayne State University, 666 W. Hancock St, Detroit, MI 48201, USAM. R. GoadSchool of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, UKH. NetzerSchool of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, IsraelD. StarkeySUPA Physics and Astronomy, University of St Andrews, Scotland KY16 9SS, UKP. UttleyAnton Pannekoek Institute, University of Amsterdam, Postbus 94249, NL-1090 GE Amsterdam, the NetherlandsW. N. BrandtDepartment of Astronomy and Astrophysics, Eberly College of Science, The Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USAK. T. KoristaDepartment of Physics, Western Michigan University, 1120 Everett Tower, Kalamazoo, MI 49008-5252, USAA. LohfinkDepartment of Physics, Montana State University, Bozeman, MT 59717-3840, USAChristopher A. OnkenAustralian Research Council (ARC) Centre of Excellence for All-sky Astrophysics (CAASTRO), Canberra, ACT 2601, AustraliaK. L. PageSchool of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, UKM. H. SiegelDepartment of Astronomy and Astrophysics, Eberly College of Science, The Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USAM. VestergaardNiels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen Ø, DenmarkS. BisogniDipartimento di Fisica e Astronomia, Università degli Studi di Firenze, Via. G. Sansone 1, I-50019 Sesto Fiorentino (FI), ItalyA. A. BreeveldMullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, UKS. B. CenkoAstrophysics Science Division, NASA Goddard Space Flight Center, MC 661, Greenbelt, MD 20771, USAE. Dalla BontàDipartimento di Fisica e Astronomia ‘G. Galilei’, Università di Padova, Vicolo dell’Osservatorio 3, I-35122 Padova, ItalyN. GehrelsSchool of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, UKG. J. FerlandDepartment of Physics, University of Kentucky, Lexington, KY 40506, USAD. González–BuitragoInstituto de Astronomía, Universidad Nacional Autónoma de México, Km 103 Carretera Tijuana-Ensenada, 22860 Ensenada B.C., MéxicoD. GrupeDepartment of Earth and Space Sciences, Morehead State University, 235 Martindale Drive, Morehead, KY 40351, USAM. D. JonerDepartment of Physics and Astronomy, N283 ESC, Brigham Young University, Provo, UT 84602-4360, USAG. A. KrissSpace Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218, USAS. J. LaporteDepartment of Astronomy and Astrophysics, The Pennsylvania State University, University Park, PA 16802, USAS. MathurCenter for Cosmology and AstroParticle Physics, The Ohio State University, 192 West Woodruff Avenue, Columbus, OH 43210, USAF. E. MarshallAstrophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USAM. MehdipourSRON Netherlands Institute for Space Research, Sorbonnelaan 2, NL-3584 CA Utrecht, the NetherlandsD. MuddDepartment of Physics and Astronomy, 4129 Frederick Reines Hall, University of California, Irvine, CA 92697, USAB. M. PetersonCenter for Cosmology and AstroParticle Physics, The Ohio State University, 192 West Woodruff Avenue, Columbus, OH 43210, USAThomas SchmidtDepartment of Physics and Astronomy, 4129 Frederick Reines Hall, University of California, Irvine, CA 92697, USAS. VaughanSchool of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, UKStefano ValentiDepartment of Physics, University of California, Davis, CA 95616, USA

2020en

ABI

Аннотация

ABSTRACT We present results of time-series analysis of the first year of the Fairall 9 intensive disc-reverberation campaign. We used Swift and the Las Cumbres Observatory global telescope network to continuously monitor Fairall 9 from X-rays to near-infrared at a daily to subdaily cadence. The cross-correlation function between bands provides evidence for a lag spectrum consistent with the τ ∝ λ4/3 scaling expected for an optically thick, geometrically thin blackbody accretion disc. Decomposing the flux into constant and variable components, the variable component’s spectral energy distribution is slightly steeper than the standard accretion disc prediction. We find evidence at the Balmer edge in both the lag and flux spectra for an additional bound-free continuum contribution that may arise from reprocessing in the broad-line region. The inferred driving light curve suggests two distinct components, a rapidly variable (&lt;4 d) component arising from X-ray reprocessing, and a more slowly varying (&gt;100 d) component with an opposite lag to the reverberation signal.

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Идентификаторы

DOI: 10.1093/mnras/staa2365

Цитирования и источники

Цитирований: 2Использованных источников: 0

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