Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978mnras.183..129e&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 183, Apr. 1978, p. 129-157. Research supported by the Science Research
Astronomy and Astrophysics
Astronomy
221
Galactic Radiation, Luminous Intensity, Satellite Observation, Seyfert Galaxies, X Ray Sources, Ariel 5 Satellite, Spaceborne Astronomy, X Ray Astronomy, X Ray Density Measurement
Scientific paper
Previous source identifications implying that Seyfert galaxies commonly are powerful X-ray sources are investigated from a statistical viewpoint and shown not to be chance coincidences. Results are also presented for a specific search of Ariel 5 data for X-ray emission from a large sample of Seyfert galaxies, using the point summation technique. Two positive identifications are obtained together with upper limits for 65 other Seyferts. Correlations of the X-ray luminosity with properties in other wavebands are examined, and the physical association between the X-ray emission and other components of Seyfert nuclei is discussed. The X-ray luminosity function of Seyfert galaxies is derived, their contribution to the isotropic X-ray background radiation is estimated, and the radiation mechanism is considered. It is concluded that: (1) X-ray emission at power levels of 10 to the (42nd to 45th) power erg/s in the 2-10-keV band is a common property of type I Seyferts; (2) the emission probably originates in a small 'core' region in the very heart of a Seyfert nucleus; (3) synchrotron self-Compton radiation is the most plausible emission mechanism; and (4) Seyferts contribute 6 percent (plus or minus 3 percent) of the isotropic X-ray background radiation in the 2-10-keV band.
Elvis Martin
Fosbury Robert A. E.
Maccacaro Tomasso
Penston Michael V.
Perola Giuseppe Cesare
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