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

As part of an extensive multiwavelength monitoring campaign, the International 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 Lyα and C IV, 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 IV and Lyα 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 Lyα and C IV line profiles, indicating evolution in the detailed properties and/or distribution of the broad-line emitting gas.

[1]  Bradley M. Peterson,et al.  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 , 1998 .

[2]  B. M. Peterson,et al.  New Constraints on the Continuum Emission Mechanism of Active Galactic Nuclei: Intensive Monitoring of NGC 7469 in the X-Ray and Ultraviolet , 1998, astro-ph/9804135.

[3]  M. Goad,et al.  Broad Emission Line Variability as a Constraint upon the Physical Conditions within the Broad Emission Line Region of NGC 5548 , 1998 .

[4]  Bradley M. Peterson,et al.  On Uncertainties in Cross‐Correlation Lags and the Reality of Wavelength‐dependent Continuum Lags in Active Galactic Nuclei , 1998, astro-ph/9802103.

[5]  Gerard A. Kriss,et al.  Steps toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. XI. Intensive Monitoring of the Ultraviolet Spectrum of NGC 7469 , 1997 .

[6]  Claudia Winge,et al.  Steps toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. X. Variability of Fairall 9 from Optical Data , 1997 .

[7]  J. Newman,et al.  Rejection of the Binary Broad-Line Region Interpretation of Double-peaked Emission Lines in Three Active Galactic Nuclei , 1997, astro-ph/9706222.

[8]  Claudia Winge,et al.  Steps toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. IX. Ultraviolet Observations of Fairall 9 , 1997 .

[9]  Gerard A. Kriss,et al.  The Variability and Spectrum of NGC 5548 in the Extreme Ultraviolet , 1997 .

[10]  M. Livio,et al.  On the Observational Evidence for Accretion Disks in Active Galactic Nuclei , 1997 .

[11]  R. Vio,et al.  The nature of the broad-line region in the radio-loud active galactic nucleus 3C 390.3 , 1997, astro-ph/9703091.

[12]  Paul T. O'Brien,et al.  X-Ray Observations of the Broad-Line Radio Galaxy 3C 390.3 , 1997, astro-ph/9703013.

[13]  M. Gaskell,et al.  Evidence for Binary Orbital Motion of a Quasar Broad-Line Region , 1996, astro-ph/9605185.

[14]  Wei Zheng.  Study of Time Varitions of UV Continuum and Emission Lines in 3C 390.3 , 1996, astro-ph/9603008.

[15]  M. Livio,et al.  The Resolved Fe K alpha Line of the Broad-Line Radio Galaxy 3C 390.3 and Its Implications , 1996 .

[16]  V. Zitelli,et al.  The Galaxy Component and Nuclear Flux Measurements of NGC 5548 from Direct Imaging , 1995 .

[17]  Paul T. O'Brien,et al.  The luminosity-dependent broad-line region in active galactic nuclei , 1995 .

[18]  Ian N. Evans,et al.  Steps toward determination of the size and structure of the broad-line region in active galatic nuclei. 8: an intensive HST, IUE, and ground-based study of NGC 5548 , 1995 .

[19]  Bradley M. Peterson,et al.  COMMENTS ON CROSS-CORRELATION METHODOLOGY IN VARIABILITY STUDIES OF ACTIVE GALACTIC NUCLEI , 1994 .

[20]  P. F. Younger,et al.  Steps toward determination of the size and structure of the broad-line region in active nuclei. 7: Variability of the optical spectrum of NGC 5548 over years , 1994 .

[21]  Y. Kohmura,et al.  X-Ray Continuum and Iron K Emission Line from the Radio Galaxy 3C 390.3 , 1994 .

[22]  B. Peterson,et al.  Reverberation mapping of the broad-line region in active galactic nuclei , 1994 .

[23]  E. al.,et al.  Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. 6: Variability of NGC 3783 from ground-based data , 1993, astro-ph/9311002.

[24]  Paul S. Smith,et al.  Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. IV - Intensity variations of the optical emission lines of NGC 5548 , 1993 .

[25]  Bradley M. Peterson,et al.  REVERBERATION MAPPING OF ACTIVE GALACTIC NUCLEI , 1993 .

[26]  Paul S. Smith,et al.  Variations of the ultraviolet Fe II and Balmer continuum emission in the Seyfert galaxy NGC 5548 , 1993 .

[27]  R. Pogge,et al.  Extended near-ultraviolet continuum emission and the nature of the polarized broad-line seyfert 2 galaxies , 1993 .

[28]  W. Kollatschny,et al.  Steps toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. XV. Long-Term Optical Monitoring of NGC 5548 , 1992, astro-ph/9808236.

[29]  Wei Zheng,et al.  3C 390.3: Modeling Variable Profile Humps , 1991 .

[30]  Unique broad-line profile variations in the radio galaxy 3C 390. 3 , 1991 .

[31]  Gerard A. Kriss,et al.  Ultraviolet variability of NGC 5548 : dynamics of the continuum production region and geometry of the broad-line region , 1991 .

[32]  Bradley M. Peterson,et al.  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 , 1991 .

[33]  Wei Zheng,et al.  Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. I, an 8 month campaign of monitoring NGC 5548 with IUE , 1991 .

[34]  A. Filippenko,et al.  Kinematic evidence for a relativistic Keplerian disk - Arp 102B , 1989 .

[35]  D. Maoz,et al.  Evaluation of the cross-correlation method and the size of AGN emission-line regions , 1989 .

[36]  Timothy R. White,et al.  Effects of cold matter in active galactic nuclei - A broad hump in the X-ray spectra , 1988 .

[37]  Martin J. Rees,et al.  ‘Cold’ material in non-thermal sources , 1988 .

[38]  R Edelson,et al.  The Discrete Correlation Function: a New Method for Analyzing Unevenly Sampled Variability Data , 1988 .

[39]  E. Mediavilla,et al.  An accretion disc in the broad-line radio galaxy 3C 390.3 ? , 1988 .

[40]  C. Gaskell.  Direct Evidence for Gravitational Domination of the Motion of Gas within One Light-Week of the Central Object in NGC 4151 and the Determination of the Mass of the Probable Black Hole , 1988 .

[41]  C. Gaskell.  Double peaked broad line profiles — edge on accretion disks or double quasar nuclei? , 1988 .

[42]  W. Wamsteker,et al.  The fading of the narrow-line region in 3C 390.3 , 1987 .

[43]  M. Orr,et al.  Relativistic beaming and quasar statistics , 1982 .

[44]  Christopher F. McKee,et al.  Reverberation mapping of the emission line regions of Seyfert galaxies and quasars. , 1982 .

[45]  M. Longair,et al.  The variability of 3C 390.3 , 1980 .