Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...242..492k&link_type=abstract
Astrophysical Journal, Part 1, vol. 242, Dec. 1, 1980, p. 492-501.
Astronomy and Astrophysics
Astronomy
208
Galactic Radiation, Seyfert Galaxies, Spaceborne Astronomy, X Ray Astronomy, Forbidden Transitions, H Beta Line, Infrared Radiation, Luminous Intensity, Oxygen Spectra, Spectral Correlation, Spectral Line Width
Scientific paper
Thirty-seven Seyfert galaxies have been observed with the Imaging Proportional Counter on the Einstein Observatory. X-ray emission from 20 Seyfert 1 galaxies, three of which have been previously detected, and from four Seyfert 2 galaxies. Significant correlations are found between the 2 keV X-ray flux and the nonstellar continuum near 3.5 microns, the nonstellar B band continuum, and the H-beta line flux, and also between 0.5-4.5 keV X-ray luminosity and the zero intensity width of the H-beta emission line and the H-beta forbidden O III ratio. These correlations apply to both types of Seyfert galaxy, as well as the X-ray selected QSOs of Gindlay et al., suggesting that the same physical process operates in each one over a continuous range of intrinsic luminosity.
Canizares Calude R.
Kriss Gerard Anthony
Ricker George R.
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