Variability of NGC 5548: The lines

Astronomy and Astrophysics – Astronomy

Scientific paper

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Galactic Radiation, Iue, Line Spectra, Seyfert Galaxies, Spaceborne Astronomy, Ultraviolet Astronomy, Ultraviolet Spectra, Variable Stars, Continuums, Emission Spectra, Lyman Alpha Radiation, Variability

Scientific paper

Two broad components in the strongest UV emission lines of NGC 5548 are identified. The components respond differently to continuum changes. A normal broad (5000 km/sec) line is related to the UV flux, but the data-set only provides an upper limit for the possible lag. The very broad (10000 km/sec) line does not appear to be affected by continuum changes. The physical conditions in the BLR and VBLR seem to be widely different.

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