Intensive disc-reverberation mapping of Fairall 9: 1st year of Swift & LCO monitoring,Monthly Notices of the Royal Astronomical Society

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Intensive disc-reverberation mapping of Fairall 9: 1st year of Swift & LCO monitoring
Monthly Notices of the Royal Astronomical Society ( IF 4.8 ) Pub Date : 2020-09-21 , DOI: 10.1093/mnras/staa2365
J V Hernández Santisteban ₁ , R Edelson ₂ , K Horne ₁ , J M Gelbord _{3,

4} , A J Barth ₅ , E M Cackett ₆ , M R Goad ₇ , H Netzer ₈ , D Starkey ₁ , P Uttley ₉ , W N Brandt _{10,

11,

12} , K Korista ₁₃ , A M Lohfink ₁₄ , C A Onken _{15,

16} , K L Page ₇ , M Siegel ₁₀ , M Vestergaard ₁₇ , S Bisogni ₁₈ , A A Breeveld ₁₉ , S B Cenko _{20,

21} , E Dalla Bontã _{22,

23} , P A Evans ₇ , G Ferland ₂₄ , D H Gonzalez-Buitrago ₂₅ , D Grupe ₂₆ , M D Joner ₂₇ , G Kriss ₂₈ , S J LaPorte ₂₉ , S Mathur _{30,

31} , F Marshall ₃₂ , M Mehdipour ₃₃ , D Mudd ₅ , B M Peterson _{28,

30,

31} , T Schmidt ₅ , S Vaughan ₇ , S Valenti ₃₄

Affiliation

SUPA Physics and Astronomy, University of St Andrews, KY16 9SS, Scotland, UK
Department of Astronomy, University of Maryland, College Park, MD 20742-2421, USA
Spectral Sciences Inc., 4 Fourth Ave., Burlington, MA 01803, USA
Eureka Scientific Inc., 2452 Delmer St., Suite 100, Oakland, CA 94602, USA
Department of Physics and Astronomy, 4129 Frederick Reines Hall, University of California, Irvine, CA 92697, USA
Department of Physics and Astronomy, Wayne State University, 666 W. Hancock St., Detroit, MI 48201, USA
University of Leicester, School of Physics and Astronomy, Leicester, LE1 7RH, UK
School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel
Anton Pannekoek Institute, University of Amsterdam, Postbus 94249, NL-1090 GE Amsterdam, The Netherlands
Department of Astronomy and Astrophysics, Eberly College of Science, The Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USA
Institute of Gravitation & the Cosmos, The Pennsylvania State University, University Park, PA 16802, USA
Department of Physics, The Pennsylvania State University, University Park, PA 16802, USA
Department of Physics, Western Michigan University, 1120 Everett Tower, Kalamazoo, MI 49008-5252, USA
Department of Physics, Montana State University, Bozeman, MT 59717-3840, USA
Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611, Australia
Australian Research Council (ARC) Centre of Excellence for All-sky Astrophysics (CAASTRO)
Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen Ø, Denmark
Dipartimento di Fisica e Astronomia, Università degli Studi di Firenze, Via. G. Sansone 1, I-50019 Sesto Fiorentino (FI), Italy
Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey RH5 6NT, UK
Astrophysics Science Division, NASA Goddard Space Flight Center, MC 661, Greenbelt, MD 20771, USA
Joint Space-Science Institute, University of Maryland, College Park, MD 20742, USA
Dipartimento di Fisica e Astronomia “G. Galilei,” Università di Padova, Vicolo dell’Osservatorio 3, I-35122 Padova, Italy
INAF-Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5 I-35122, Padova, Italy
Department of Physics, University of Kentucky, Lexington KY 40506, USA
Instituto de Astronomía, Universidad Nacional Autónoma de México. Km 103 Carretera Tijuana-Ensenada, 22860 Ensenada, B.C., México
Department of Earth and Space Sciences, Morehead State University, 235 Martindale Drive, Morehead, KY 40351, USA
Department of Physics and Astronomy, N283 ESC, Brigham Young University, Provo, UT 84602-4360, USA
Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218, USA
Department of Astronomy and Astrophysics, The Pennsylvania State University, University Park, PA 16802, USA
Department of Astronomy, The Ohio State University, 140 W 18th Ave., Columbus, OH 43210, USA
Center for Cosmology and AstroParticle Physics, The Ohio State University, 192 West Woodruff Avenue, Columbus, OH 43210, USA
Astrophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
Department of Physics, University of California, Davis, CA 95616, USA

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 sub-daily 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 ( 100 days) component with an opposite lag to the reverberation signal.

中文翻译：

Fairall 9 的密集光盘混响映射：Swift 和 LCO 监测的第一年

我们展示了 Fairall 9 密集唱片混响活动第一年的时间序列分析结果。我们使用 Swift 和 Las Cumbres 天文台全球望远镜网络，以每日到次日的节奏持续监测从 X 射线到近红外的 Fairall 9。波段之间的互相关函数为滞后谱提供了证据，该滞后谱与光学厚、几何薄黑体吸积盘预期的 τ ∝ λ4/3 标度一致。将通量分解为常数和可变分量，可变分量的光谱能量分布比标准吸积盘预测略陡。我们在滞后和通量谱中的 Balmer 边缘找到了证据，证明可能由宽线区域中的再处理产生的额外的无界连续谱贡献。

更新日期：2020-09-21

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