Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.176...69p&link_type=abstract
In ESA 3rd European IUE Conf. p 69-74 (SEE N83-11889 02-88)
Astronomy and Astrophysics
Astronomy
5
Active Galaxies, Bl Lacertae Objects, Emission Spectra, Quasars, Seyfert Galaxies, Ultraviolet Astronomy, Black Body Radiation, Galactic Nuclei, Ionization, Iue, Line Spectra, Ultraviolet Spectra
Scientific paper
The IUE contribution to the study of active galaxies and quasars fainter than the 16th magnitude is summarized. The IUE provides a diagnostic for the source of ionization in active galaxies and casts light on the excitation mechanism of the Fe II lines. It shows that the broad hydrogen lines in Seyferts and quasars are not in their recombination ratios and demonstrates the absence of gas in BL Lacertae objects. The IUE data support the gravitational lense explanation of the double quasar and demonstrate the presence of a hot (30,000 K) black body in active nuclei. The IUE discovered stratification of the ionization conditions in the broad line regions of active nuclei.
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