The ratio of X-ray-to-optical luminosity for active galactic nuclei

Details The ratio of X-ray-to-optical luminosity for active galactic nuclei The ratio of X-ray-to-optical luminosity for active galactic nuclei

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.208..799c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 208, June 15, 1984, p. 799-811. Sponsorship: Consiglio

Astronomy and Astrophysics

Astronomy

10

Active Galactic Nuclei, Interstellar Extinction, Luminosity, Quasars, Seyfert Galaxies, X Ray Sources, Astronomical Photometry, Galactic Radiation, Light Emission

Scientific paper

The authors show that the apparent enhancement of the average ratio of X-ray to optical luminosity for Seyfert 1 nuclei, in comparison with radio quiet QSOs, may be largely, if not totally, due to internal reddening. Estimates of the average optical to X-ray energy index, αox, for five independent samples covering, altogether, over three orders of magnitude in optical luminosity, are all consistent with αox ≅ 1.55 and a dispersion σ ≅ 0.15. A comparison of optical and X-ray counts adds support to this conclusion.

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