April 1999 from the BeppoSAX Calendar
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BeppoSAX broad-band X-Ray spectra of
two Active Galactic Nuclei: the Quasar 3C273 and the Seyfert type 2 galaxy MKN
3. The spectral distibutions are similar above approximately 10 keV
(PDS data) but very different at lower energies where
intervening materials in MKN 3 absorbe most of the soft X-rays.
Courtesy of M. Cappi, L. Bassani, TeSRE Institute, CNR, Bologna,
Italy. Strongly different spectra such as those of 3C273 and MKN 3
can simply be the result of different source orientations as predicted
by the "Unified Schemes of AGN". The diagram on the right side, adapted
from Urry and Padovani, shows the basic assumptions of this theory.
Courtesy of M. Polletta, ITESRE/CNR, Bologna, Italy
Images courtesy of the Agenzia Spaziale Italiana (ASI) and the
BeppoSAX Science Data Center (SDC).
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