Variability of the optical-UV continuum in NGC 5548 - Implications for accretion-disc models

Details Variability of the optical-UV continuum in NGC 5548 - Implications for accretion-disc models Variability of the optical-UV continuum in NGC 5548 - Implications for accretion-disc models

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.255...27m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 255, March 1, 1992, p. 27-31.

Astronomy and Astrophysics

Astronomy

30

Accretion Disks, Astronomical Models, Continuous Radiation, Seyfert Galaxies, Ultraviolet Radiation, Variability, Active Galactic Nuclei, Light Curve, Visible Spectrum, X Ray Astronomy

Scientific paper

The recent campaign of systematic UV and optical observations of NGC 5548 shows that the continuum varies virtually simultaneously at ultraviolet and optical frequencies, with an upper limit to the delay of less than 4 d. This result is studied in the context of accretion-disk models. Variations in the accretion rate and propagation of sound waves cannot be reconciled with the time-delay constraint. Reprocessing of the hard radiation produced in the inner region by the outer part of the disk emitting in the optical band - which would be consistent with the time-delay limit - is unimportant in the standard model due to the small solid angle subtended by the relevant region of the disk. Therefore a modified self-irradiating disk model is considered in which the central region is blown up into a bulgelike shape. This model is consistent with the current observational information on the optical and UV variability of NGC 5548, provided that the bulge has a radius of 6 x 10 exp 14 cm and a luminosity ranging between about 5 and 10 x 10 exp 44 erg/s.

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