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Steps toward Determination of the Size and Structure of the Broad‐Line Region in Active Galactic Nuclei. XIV. Intensive Optical Spectrophotometric Observations of NGC 7469

S. CollierSchool of Physics and Astronomy, University of St. Andrews, St. Andrews, KY16 9SS ScotlandK. HorneSchool of Physics and Astronomy, University of St. Andrews, St. Andrews, KY16 9SS ScotlandS. KaspiSchool of Physics and Astronomy and the Wise Observatory, The Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, IsraelH. NetzerSchool of Physics and Astronomy and the Wise Observatory, The Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, IsraelB. M. PetersonDepartment of Astronomy, Ohio State University, 174 West 18th Avenue, Columbus, OH 43210I. WandersDepartment of Astronomy, Ohio State University, 174 West 18th Avenue, Columbus, OH 43210Tal AlexanderSchool of Physics and Astronomy and the Wise Observatory, The Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, IsraelR. BertramDepartment of Astronomy, Ohio State University, 174 West 18th Avenue, Columbus, OH 43210A. ComastriOsservatorio Astronomico di Bologna, via Zamboni 33, I-40126, Bologna, ItalyC. M. GaskellBehlen Observatory, University Of Nebraska, Department of Physics and Astronomy, Lincoln, NE 68588-0111Yu. F. MalkovCrimean Astrophysical Observatory, P/O Nauchny, 334413 Crimea, UkraineDan MaozSchool of Physics and Astronomy and the Wise Observatory, The Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, IsraelM. MignoliOsservatorio Astronomico di Bologna, via Zamboni 33, I-40126, Bologna, ItalyRichard W. PoggeDepartment of Astronomy, Ohio State University, 174 West 18th Avenue, Columbus, OH 43210V. I. PronikCrimean Astrophysical Observatory, P/O Nauchny, 334413 Crimea, UkraineС. Г. СергеевCrimean Astrophysical Observatory, P/O Nauchny, 334413 Crimea, UkraineS. SneddenBehlen Observatory, University Of Nebraska, Department of Physics and Astronomy, Lincoln, NE 68588-0111G. M. StirpeOsservatorio Astronomico di Bologna, via Zamboni 33, I-40126, Bologna, ItalyN. G. BochkarevA. N. BurenkovSpecial Astrophysical Observatory of Russian Academy of Sciences, Nyzhnij Arkhyz, RussiaA. I. ShapovalovaSpecial Astrophysical Observatory of Russian Academy of Sciences, Nyzhnij Arkhyz, RussiaR. M. WagnerDepartment of Astronomy, Ohio State University, 174 West 18th Avenue, Columbus, OH 43210

1998en

ABI

Annotatsiya

We present results of an intensive 2 month campaign of ground-based spectrophotometric monitoring of the Seyfert 1 galaxy NGC 7469, with a temporal resolution [approximately less than]1 day. The broad Hα and Hβ emission lines respond to ~35% ultraviolet continuum variations with an amplitude of ~10% and time delays of 5.6±1.3 days and 5.4±0.8 days, respectively. We interpret this as evidence of variable Balmer line gas ~5-6 light days from the central source in this object, widely believed to be a supermassive black hole. The virial mass of the central source implied by line widths and time delays is ~106-107 M◉ Concomitantly, we find evidence for wavelength-dependent continuum time delays : optical continuum variations lag those at 1315 Å by 1.0±0.3 days at 4865 Å to 1.5±0.7 days at 6962 Å. . This suggests a stratified continuum reprocessing region extending several light days from the central source, possibly an accretion disk.

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DOI: 10.1086/305720

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