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

SJ Collier, Keith Douglas Horne, S Kaspi, H Netzer, BM Peterson, I Wanders, T Alexander, R Bertram, A Comastri, CM Gaskell, YF Malkov, D Maoz, M Mignoli, RW Pogge, VI Pronik

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167 Citations (Scopus)

Abstract

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 less than or similar to 1 day. The broad Ha and HE emission lines respond to similar to 35% ultraviolet continuum variations with an amplitude of similar to 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 similar to 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 similar to 10(6)-10(7) M-.. Concomitantly, we find evidence for wavelength-dependent continuum time delays: optical continuum variations lag those at 1315 Angstrom by 1.0 +/- 0.3 days at 4865 Angstrom to 1.5 +/- 0.7 days at 6962 Angstrom. This suggests a stratified continuum reprocessing region extending several light days from the central source, possibly an accretion disk.

Original languageEnglish
Pages (from-to)162
Number of pages162
JournalAstrophysical Journal
Volume500
Publication statusPublished - 10 Jun 1998

Keywords

  • galaxies, active
  • galaxies, individual (NGC 7469)
  • galaxies, nuclei
  • galaxies, Seyfert
  • SHORT-TIMESCALE VARIABILITY
  • MULTIWAVELENGTH OBSERVATIONS
  • SEYFERT-GALAXIES
  • EMISSION-LINES
  • NGC-5548
  • CONTINUUM
  • NGC-4151
  • WAVELENGTHS
  • NGC-3783
  • ACCURACY

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