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

PT O'Brien, M Dietrich, K Leighly, D Alloin, J Clavel, DM Crenshaw, Keith Douglas Horne, GA Kriss, JH Krolik, MA Malkan, H Netzer, BM Peterson, GAR Reichert

Research output: Contribution to journalArticlepeer-review

76 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)163-176
Number of pages14
JournalAstrophysical Journal
Volume509
Issue number1
Publication statusPublished - 10 Dec 1998

Keywords

  • galaxies : active
  • galaxies : individual (3C 390.3)
  • ultraviolet : galaxies
  • SHORT-TIMESCALE VARIABILITY
  • MULTIWAVELENGTH OBSERVATIONS
  • X-RAY
  • EMISSION-LINES
  • OPTICAL WAVELENGTHS
  • ACCRETION DISKS
  • UV CONTINUUM
  • NGC-5548
  • NGC-4151
  • 3C-390.3

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