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

Details 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 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

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...500..162c&link_type=abstract

Astrophysical Journal v.500, p.162

Astronomy and Astrophysics

Astronomy

104

Galaxies: Active, Galaxies: Individual Ngc Number: Ngc 7469, Galaxies: Nuclei, Galaxies: Seyfert

Scientific paper

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 <~ 1 day. The broad H alpha and H beta emission lines respond to ~35% ultraviolet continuum variations with an amplitude of ~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 ~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 ~106-107 M&sun;. Concomitantly, we find evidence for wavelength-dependent continuum time delays: optical continuum variations lag those at 1315 Angstroms by 1.0 +/- 0.3 days at 4865 Angstroms to 1.5 +/- 0.7 days at 6962 Angstroms. This suggests a stratified continuum reprocessing region extending several light days from the central source, possibly an accretion disk.

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