Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. II - an intensive study of NGC 5548 at optical wavelengths
B. M. PetersonUniversity of California, Santa Cruz, Santa Cruz, United StatesT. J. BalonekColgate University, Hamilton, United StatesE. S. BarkerThe University of Texas at Austin, Austin, United StatesJill BechtoldUniversity of Arizona, Tucson, United StatesR. BertramThe Ohio State University, Columbus, United StatesN. G. BochkarevLomonosov Moscow State University, Moscow, RussiaM. BolteNational Academies of Sciences, Engineering, and Medicine, Washington, United StatesD. BondNational Academies of Sciences, Engineering, and Medicine, Washington, United StatesTodd A. BorosonCarnegie Institution for Science, Washington, United StatesM. T. CariniGeorgia State University, Atlanta, United StatesT. E. CaroneUniversity of Arizona, Tucson, United StatesJ. A. ChristensenColgate University, Hamilton, United StatesS. D. ClementsUniversity of Florida, Gainesville, United StatesA. L. CochranThe University of Texas at Austin, Austin, United StatesR. D. CohenUniversity of California, San Diego, San Diego, United StatesD. CramptonNational Academies of Sciences, Engineering, and Medicine, Washington, United StatesM. DietrichUniversity of Göttingen, Göttingen, GermanyM. ElvisHarvard University, Cambridge, United StatesA. M. N. FergusonNational Academies of Sciences, Engineering, and Medicine, Washington, United StatesA. V. FilippenkoUniversity of California, Berkeley, Berkeley, United StatesK. J. FrickeUniversity of Göttingen, Göttingen, GermanyC. M. GaskellUniversity of Michigan–Ann Arbor, Ann Arbor, United StatesJ. P. HalpernJ. P. HuchraHarvard University, Cambridge, United StatesJ. B. HutchingsNational Academies of Sciences, Engineering, and Medicine, Washington, United StatesW. KollatschnyUniversity of Göttingen, Göttingen, GermanyAnuradha KoratkarUniversity of Michigan–Ann Arbor, Ann Arbor, United StatesK. T. KoristaCarnegie Institution for Science, Washington, United StatesJulian H. KrolikJohns Hopkins University, Baltimore, United StatesN. J. LameThe Ohio State University, Columbus, United StatesAri LaorTel Aviv University, Tel Aviv, IsraelR. J. LeacockUniversity of Florida, Gainesville, United StatesG. M. MacAlpineUniversity of Michigan–Ann Arbor, Ann Arbor, United StatesM. A. MalkanUniversity of California, Los Angeles, Los Angeles, United StatesDan MaozTel Aviv University, Tel Aviv, IsraelH. R. MillerGeorgia State University, Atlanta, United StatesS. L. MorrisCarnegie Institution for Science, Washington, United StatesH. NetzerTel Aviv University, Tel Aviv, IsraelClaudia L. Mendes de OliveiraUniversity of British Columbia, Vancouver, CanadaJ. E. PenfoldMount Royal University, Calgary, CanadaM. V. PenstonE. PérezRichard W. PoggeThe University of Texas at Austin, Austin, United StatesM. RichmondUniversity of California, Berkeley, Berkeley, United StatesW. RomanishinUniversity of Oklahoma, Norman, United StatesE. I. RosenblattUniversity of California, Los Angeles, Los Angeles, United StatesLes SaddlemyerNational Academies of Sciences, Engineering, and Medicine, Washington, United StatesA. C. SadunAgnes Scott College, Decatur, United StatesS. R. SawyerThe University of Texas at Austin, Austin, United StatesJoseph C. ShieldsUniversity of California, Berkeley, Berkeley, United StatesA. I. ShapovalovaA. G. SmithUniversity of Florida, Gainesville, United StatesH. A. SmithMichigan State University, East Lansing, United StatesPaul S. SmithUniversity of Arizona, Tucson, United StatesWei‐Hsin SunNational Central University, Taoyuan City, TaiwanU. ThieleMax Planck Society, Munich, GermanyT. J. TurnerGoddard Space Flight Center, Greenbelt, United StatesSylvain VeilleuxUniversity of California, Santa Cruz, Santa Cruz, United StatesR. M. WagnerThe Ohio State University, Columbus, United StatesR. J. WeymannCarnegie Institution for Science, Washington, United StatesB. J. WilkesHarvard University, Cambridge, United StatesBeverley J. WillsThe University of Texas at Austin, Austin, United StatesD. WillsThe University of Texas at Austin, Austin, United StatesP. F. YoungerNational Academies of Sciences, Engineering, and Medicine, Washington, United States
1991en
ABI
Аннотация
We report on a large, international program of ground-based optical spectroscopy and photometry of the variable Seyfert 1 galaxy NGC 5548 undertaken in support of an IUE monitoring campaign described by Clavel and coworkers. In this contribution, we present the data base and describe the methods used to correct for systematic differences between spectra from different sources. Optical continuum and Hβ emission-line light curves are derived from the spectra. The behavior of the optical continuum is qualitatively the same as the behavior of the ultraviolet continuum. Cross-correlation of the ultraviolet and optical continuum measurements does not reveal any significant lag between them. The Hβ emission-line variations show the same basic pattern as seen in the continuum and ultraviolet emission lines, with Hβ lagging behind the continuum by ~ 20 days. This is significantly larger than the ~ 10 day lag deduced for Lyα.
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