Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/32385
Title: | Intensive disc-reverberation mapping of Fairall 9: First year of Swift and LCO monitoring | Authors: | Santisteban, J. V.Hernández Edelson, R. Horne, K. Gelbord, J. M. Barth, A. J. Cackett, E. M. Goad, M. R. Netzer, H. Starkey, D. Uttley, P. Brandt, W. N. Korista, K. Lohfink, A. M. Onken, C. A. Page, K. L. Siegel, M. Vestergaard, M. Bisogni, Susanna Breeveld, A. A. Cenko, S. B. Bontà, E. Dalla Evans, P. A. Ferland, G. Gonzalez-Buitrago, D. H. Grupe, D. Joner, M. D. Kriss, G. LaPorte, S. J. Mathur, S. Marshall, F. Mehdipour, M. Mudd, D. Peterson, B. M. SCHMIDT, TOBIAS MARIUS Vaughan, S. Valenti, S. |
Issue Date: | 2020 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 498 | Issue: | 4 | First Page: | 5399 | 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 (<4 d) component arising from X-ray reprocessing, and a more slowly varying (>100 d) component with an opposite lag to the reverberation signal. | URI: | http://hdl.handle.net/20.500.12386/32385 | URL: | https://academic.oup.com/mnras/article/498/4/5399/5909603 https://api.elsevier.com/content/abstract/scopus_id/85097177351 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/staa2365 | Bibcode ADS: | 2020MNRAS.498.5399H | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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Hernandez_Santisteban+20.pdf | Pdf editoriale | 6.58 MB | Adobe PDF | View/Open |
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