ROSAT/XRT-PSPC observations and the ionizing continuum of Seyfert 1 galaxy MKN 478

Details ROSAT/XRT-PSPC observations and the ionizing continuum of Seyfert 1 galaxy MKN 478 ROSAT/XRT-PSPC observations and the ionizing continuum of Seyfert 1 galaxy MKN 478

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.268..973g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 268, NO. 4/JUN15, P. 973, 1994

Astronomy and Astrophysics

Astronomy

29

Active Galactic Nuclei, Astronomical Spectroscopy, Black Holes (Astronomy), Continuums, Energy Distribution, Ionizing Radiation, Rosat Mission, Seyfert Galaxies, Spectrum Analysis, Ultraviolet Spectra, X Ray Astronomy, X Ray Spectra, Ultraviolet Radiation, Visible Spectrum, X Rays

Scientific paper

The ROSAT/XRT-PSPC observations of the Seyfert 1 galaxy Mkn478 are presented. Together with the optical and ultraviolet spectra of this galaxy, obtained within eight months of the x-ray observations, these new data are used to determine the continuum energy distribution (CED) of Mkn478, from 1 micrometer to about 2.0 keV with a small break between 11.3 eV and 0.1 keV. The ultraviolet/soft x-ray CED is similar to the spectrum of a thin accretion disc for both a rotating and a non-rotating black hole, although both models underestimate the flux at energies higher than 0.4 keV.

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