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The broad band energy distribution of UV-bright BL Lac objects

Maraschi, L.; Tanzi, E. G.; Treves, A.

Renewed attention was paid to the study of the continuous energy distribution of BL Lac objects, bearing on the emission mechanisms of the central source, since the launch of the International Ultraviolet Explorer (IUE). The far ultraviolet domain (1000 - 3000 Å) is in fact particularly relevant to the problem, because it does not suffer from cont…

Ultraviolet spectroscopy of cometary comae: An update

Feldman, P. D.

Since its launch in 1978 the International Ultraviolet Explorer (IUE) satellite observatory has been used to record ultraviolet spectra of nearly two dozen comets. These observations have been applied principally to studies of the composition, chemistry and evolution of the gaseous coma and more recently, with the substantially increased data base…