Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980nyasa.336...59b&link_type=abstract
In: Texas Symposium on Relativistic Astrophysics, 9th, Munich, West Germany, December 14-19, 1978, Proceedings. (A80-42502 18-90
Astronomy and Astrophysics
Astronomy
11
Galactic Nuclei, Quasars, Seyfert Galaxies, Stellar Spectra, X Ray Sources, Gamma Ray Spectra, Infrared Spectra, Light (Visible Radiation), Milky Way Galaxy, Radio Astronomy, Radio Spectra, Ultraviolet Spectra, Variability, X Ray Spectra
Scientific paper
Observational data for the seven quasars or Seyfert-quasar transition objects identified with X-ray sources is reviewed for radio, infrared, optical, ultraviolet, X-ray and gamma-ray frequencies. The observational histories of the quasars 3C 273, MR 2251-178 and 0241+622 and the quasar-like Seyfert nuclei Fairall-9, Mk 509, IC 4329A and IIIZw 2 are discussed in detail, and it is noted that their X-ray variability and spectra do not differentiate them from Seyfert nuclei, supporting the similarity between the several types of active extragalactic nuclei. The space density of the six objects (excluding 3C 273) within 600 Mpc is found to be comparable to that of other Seyferts and quasars, suggesting that X-ray emitting objects constitute a substantial fraction of the luminous transition objects in the neighborhood of the Galaxy. It is also pointed out that observations of the X-ray variability of these objects, which indicates that the X-rays originate from compact regions, represent a promising means for the further understanding of the emission process.
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