Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984xue..conf..164m&link_type=abstract
In Max-Planck Inst. für Physik und Astrophysik X-Ray and UV Emission from Active Galactic Nuclei p 164-176 (SEE N85-17790 08-88)
Astronomy and Astrophysics
Astrophysics
Bl Lacertae Objects, Broadband, Energy Spectra, Quasars, Active Galactic Nuclei, Emission Spectra, Infrared Spectra, Radio Spectra, Spectral Energy Distribution, Ultraviolet Spectra, X Ray Spectra
Scientific paper
Continuum observation of active galactic nuclei from radio to X-ray frequencies is summarized, yielding an average broadband energy distribution for the two main classes of active galactic nuclei, quasars and BL Lac objects. Within quasars radio loud and radio quiet objects are distinguished. Overall similarities and differences which appear are used to discuss emission mechanisms in the various bands. An attempt is made to relate the mechanisms to a unified scheme. In the optical UV band the average spectra of quasars are much flatter than those of BL Lacs. Highly polarized quasars, which are also optically violently variable resemble BL Lac objects in the shape of the optical continuum. In the infrared, radio loud and radio quiet quasars and BL Lac objects do not differ substantially. The hypothesis that the flat optical-UV component of quasars is due to an accretion disk explains the spectral shape and low polarization of the emission in this band.
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