The state of the art in variability programs was represented by the campaign to monitor NGC 5548

The state of the art in variability programs was represented by the campaign to monitor NGC 5548

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The state of the art in variability programs was represented by the campaign to monitor NGC 5548, including 60 regularly-spaced sets of IUE spectra and intensive ground-based observations (Clavel et 56 al. 1991 ApJ 366, 64; Peterson et al. 1991 ApJ 368, 119). The main advances here were in experiment design - regular spacing of data to circumvent the need for interpolation in analysis, and space-based data to decrease the chance of a break in the series. The galaxy also cooperated, showing several strong peaks and dips in brightness over this 8-month period (December 1988 - August 1989). IUE results are shown below for various continum bands and the strong lines, with data from the International AGN Watch .
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Detailed analysis suggests that different lines come from regions with different shapes, with higher-ionization features in an inner, nearly spherical configuration, surrounded by a flattened region from which we observe C III] and Mg II. The limits here are set by how helpful the
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