188633377.Pdf
The Astrophysical Journal Supplement Series, 225:29 (15pp), 2016 August doi:10.3847/0067-0049/225/2/29 © 2016. The American Astronomical Society. All rights reserved. EVIDENCE FOR PERIODICITY IN 43 YEAR-LONG MONITORING OF NGC 5548 E. Bon1,2, S. Zucker3, H. Netzer4, P. Marziani5, N. Bon1,2, P. JovanoviĆ1,2, A. I. Shapovalova6, S. Komossa7, C. M. Gaskell8,L.Č. PopoviĆ1,2, S. Britzen7, V. H. Chavushyan9, A. N. Burenkov6, S. Sergeev10, G. La Mura11, J. R. Valdés9, and M. Stalevski1,12,13 1 Astronomical Observatory, Volgina 7, 11060 Belgrade, Serbia 2 Isaac Newton Institute of Chile, Yugoslavia Branch Belgrade, Serbia 3 Department of Geosciences, Tel-Aviv University, Tel-Aviv 6997801, Israel 4 School of Physics and Astronomy and the Wise Observatory, The Raymond and Beverly Sackler Faculty of Exact Sciences, Tel-Aviv University, Tel-Aviv 6997801, Israel 5 INAF, Osservatorio Astronomico di Padova, Padova, Italy 6 Special Astrophysical Observatory of the Russian AS, Nizhnij Arkhyz, Karachaevo-Cherkesia 369167, Russia 7 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany 8 Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064, USA 9 Instituto Nacional de Astrofsica, Óptica y Electrónica, Apartado Postal 51, CP 72000, Puebla, Pue, Mexico, Mexico 10 Crimean Astrophysical Observatory, P/O Nauchny, Republic of Crimea 298409, Russia 11 Dipartimento di Fisica e Astronomia “G. Galilei,” Università degli Studi di Padova, Vicolo dell’Osservatorio 3, I-35122—Padova, Italy 12 Departamento de Astronomía, Universidad de Chile, Camino El Observatorio 1515, Casilla 36-D Santiago, Chile 13 Sterrenkundig Observatorium, Universiteit Gent, Krijgslaan 281-S9, Gent, B-9000, Belgium Received 2016 April 10; revised 2016 June 11; accepted 2016 June 14; published 2016 August 23 ABSTRACT We present an analysis of 43 years (1972 to 2015) of spectroscopic observations of the Seyfert 1 galaxy NGC 5548.
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