The role of UV bump in line emission

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Black Body Radiation, Luminosity, Lyman Alpha Radiation, Seyfert Galaxies, Ultraviolet Emission, Continuous Radiation, Iue, Line Spectra

Scientific paper

It is suggested that the UV bump which the low-ionization lines of the Seyfert galaxy Fairall 9 follow has a shape more complicated than a simple blackbody curve and has a rather steep drop around 30 eV. The degree of luminosity dependence of the equivalent width of Ly-alpha, semiforbidden Si IV, and C IV is inversely correlated with an individual emission line's ionization level. This explains why only the C IV equivalent width exhibits a significant luminosity dependence (the Baldwin effect).

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