Steps toward Determination of the Size and Structure of the Broad‐Line Region in Active Galactic Nuclei. XVI. A 13 Year Study of Spectral Variability in NGC 5548
B. M. PetersonDepartment of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210-1173P. BerlindHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138Ray BertramMailing address: Steward Observatory, University of Arizona, Tucson, AZ 85721K. BischoffUniversitäts-Sternwarte Göttingen, Geismarlandstr. 11, D-37083 Göttingen, GermanyN. G. BochkarevSternberg Astronomical Institute, Lomonosov Moscow State University, Universitetskij Prosp. 13, Moscow 119992, RussiaN. V. BorisovSpecial Astrophysical ObservatoryA. N. BurenkovIsaac Newton InstituteM. CalkinsHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138L. CarrascoInstituto Nacional de Astrofisica, Optica y Electronica, Apartado Postal 51, CP 72000, Puebla, MexicoV. ChavushyanInstituto Nacional de Astrofisica, Optica y Electronica, Apartado Postal 51, CP 72000, Puebla, MexicoR. ChornockDepartment of Astronomy, University of California, Berkeley, CA 94720-3411Matthias DietrichDepartment of Astronomy, University of Florida, 211 Bryant Space Science Center, Gainesville, FL 32611-2055Victor DoroshenkoCrimean Laboratory of the Sternberg Astronomical Institute, p/o Nauchny, Crimea, 98409, UkraineO. V. EzhkovaUlugbek Astronomical Institute, Academy of Science of Uzbekistan, Astronomicheskaya ul. 33, Tashkent, 700052, UzbekistanA. V. FilippenkoDepartment of Astronomy, University of California, Berkeley, CA 94720-3411A. M. GilbertDepartment of Astronomy, University of California, Berkeley, CA 94720-3411J. P. HuchraHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138W. KollatschnyUniversitäts-Sternwarte Göttingen, Geismarlandstr. 11, D-37083 Göttingen, GermanyDouglas C. LeonardDepartment of Astronomy, University of California, Berkeley, CA 94720-3411Wenyu LiDepartment of Astronomy, University of California, Berkeley, CA 94720-3411V. M. LyutyCrimean Astrophysical ObservatoryYu. F. MalkovCrimean Astrophysical Observatory, P/O Nauchny, 98409 Crimea, UkraineT. MathesonDepartment of Astronomy, University of California, Berkeley, CA 94720-3411N. I. MerkulovaCrimean Astrophysical Observatory, P/O Nauchny, 98409 Crimea, UkraineV. P. MikhailovSpecial Astrophysical Observatory, Russian Academy of Sciences, Nizhnij Arkhyz, Karachai-Cherkess Republic, 357147, RussiaM. ModjazHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138Christopher A. OnkenDepartment of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210-1173Richard W. PoggeDepartment of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210-1173Vladimir I. PronikIsaac Newton Institute of Chile, Special Astrophysical Observatory Branch and Crimean BranchB. C. QianShanghai Astronomical Observatory, Shanghai 200030, ChinaP. RomanoDepartment of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210-1173Sergey G. SergeevIsaac Newton Institute of Chile, Special Astrophysical Observatory Branch and Crimean BranchЕ. А. СергееваCrimean Astrophysical Observatory, P/O Nauchny, 98409 Crimea, UkraineAlla I. ShapovalovaIsaac Newton Institute of Chile, Special Astrophysical Observatory Branch and Crimean BranchO. I. SpiridonovaSpecial Astrophysical ObservatoryJun TaoShanghai Astronomical Observatory, Shanghai 200030, ChinaSusan TokarzHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138J. R. ValdésInstituto Nacional de Astrofisica, Optica y Electronica, Apartado Postal 51, CP 72000, Puebla, MexicoВ. В. ВласюкSpecial Astrophysical Observatory, Russian Academy of Sciences, Nizhnij Arkhyz, Karachai-Cherkess Republic, 357147, RussiaR. M. WagnerDepartment of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210-1173B. J. WilkesHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138
2002en
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Annotatsiya
We present the final installment of an intensive 13 year study of variations of the optical continuum and broad Hβ emission line in the Seyfert 1 galaxy NGC 5548. The database consists of 1530 optical continuum measurements and 1248 Hβ measurements. The Hβ variations follow the continuum variations closely, with a typical time delay of about 20 days. However, a year-by-year analysis shows that the magnitude of emission-line time delay is correlated with the mean continuum flux. We argue that the data are consistent with the simple model prediction between the size of the broad-line region and the ionizing luminosity, r ∝ L . Moreover, the apparently linear nature of the correlation between the Hβ response time and the nonstellar optical continuum F opt arises as a consequence of the changing shape of the continuum as it varies, specifically F opt ∝ F .
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