Sizes of Continuum and Line Emitting Regions in Seyfert Galaxies

Details Sizes of Continuum and Line Emitting Regions in Seyfert Galaxies Sizes of Continuum and Line Emitting Regions in Seyfert Galaxies

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985baas...17..869g&link_type=abstract

Bulletin of the American Astronomical Society, Vol. 17, p.869

Astronomy and Astrophysics

Astronomy

Scientific paper

The results of studies of the phase-lag between continuum variations and line variations in Seyferts give delays of less than a light-week for the high-ionization filaments (Gaskell & Sparke 1985, ApJ, submitted). The phase lags for the low-ionization clouds are a few times longer. The light-crossing time for the inner broad-line region is shorter than the timescales for short-term flickering ("flares" and "dropouts") in the continuum. Further study indicates that the variations in the optical continuum (at 5000 Angs) probably lag the UV variations by almost a week in NGC 4151. The variability of the so-called "3000 Angstrom bump" is consistent with the bump originating in the lower-ionization BLR. It is proposed that the thermal component of the optical-UV continuum is coming from a region of about the same size as the inner broad-line region, and is intimately related to the broad-line region gas.

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