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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/27906

    Title: Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. XIII. Ultraviolet observations of the broad-line radio galaxy 3C 390.3
    Authors: O'Brien,PT;Dietrich,M;Leighly,K;Alloin,D;Clavel,J;Crenshaw,DM;Horne,K;Kriss,GA;Krolik,JH;Malkan,MA;Netzer,H;Peterson,BM;Reichert,GA;Rodriguez-Pascual,PM;Wamsteker,W;Anderson,KSJ;Bochkarev,NG;Cheng,FZ;Filippenko,AV;Gas
    Contributors: 天文研究所
    Date: 1998
    Issue Date: 2010-06-29 19:35:54 (UTC+8)
    Publisher: 中央大學
    Abstract: As part of an extensive multiwavelength monitoring campaign, the Inter national Ultraviolet Explorer satellite was used to observe the broad-line radio galaxy 3C 390.3 during the period 1994 December 31-1996 March 5. Spectra were obtained every 6-10 days. The UV continuum varied by a factor of 7 through the campaign, while the broad emission lines varied by factors of 2-5. Unlike previously monitored Seyfert 1 galaxies, in which the X-ray continuum generally varies with a larger amplitude than the UV, in 3C 390.3 the UV continuum light curve is similar in both amplitude and shape to the X-ray light curve observed by ROSAT. The UV broad emission-line variability lags that of the UV continuum by 35-70 days for Ly alpha and C rv, values larger than those found for Seyfert 1 galaxies of comparable UV luminosity. These lags are also larger than those found for the Balmer lines in 3C 390.3 over the same period. The red and blue wings of C rv and Ly alpha vary in phase, suggesting that radial motion does not dominate the kinematics of the UV line-emitting gas. Comparison with archival data provides evidence for velocity-dependent changes in the Ly alpha and C rv line profiles, indicating evolution in the detailed properties and/or distribution of the broad-line emitting gas.
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