Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296.1097f&link_type=abstract
In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 2: AGN and the X Ray Background p 1097-1104 (SEE N90-2
Astronomy and Astrophysics
Astronomy
4
Active Galactic Nuclei, Continuous Spectra, Electron-Positron Pairs, Galactic Radiation, X Ray Spectra, Astronomical Models, Background Radiation, Continuous Radiation, Quasars, Radiation Laws, Variability, X Ray Astronomy
Scientific paper
Some recent results on the origin of the continuum of Active Galactic Nuclei (AGN) are reviewed. The optical continuum is shown to originate from a larger region to the X-ray emission region. Rapid X-ray variability suggests a central engine involving a compact object. Electron-positron pairs are expected to play a role in the production and reprocessing of the hard continuum, but that role is not yet understood. The observed continuum is modified by an iron emission line and a reflection hump above approximately 10 keV. An annihilation hump may be found by the next generation of hard X-ray instruments. Sources in which the reflection hump dominates may produce the X-Ray Background (XRB). The spectrum of X-rays reflected by cold matter in sources at redshifts of 1 to 2 is a remarkably good fit to the XRB spectrum above 10 keV. Quasi Stellar Objects (QSO) can produce the XRB above 3 keV.
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