EXOSAT observations of a strong soft X-ray excess in MKN 841

Details EXOSAT observations of a strong soft X-ray excess in MKN 841 EXOSAT observations of a strong soft X-ray excess in MKN 841

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.217..105a&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 217, Nov. 1, 1985, p. 105-113. Research supported by th

Other

205

Exosat Satellite, Seyfert Galaxies, X Ray Sources, X Ray Spectra, Accretion Disks, Black Body Radiation, Luminosity, Spectral Energy Distribution, Ultraviolet Spectra

Scientific paper

EXOSAT observations of the spectrum of the Seyfert 1 galaxy MKN 841 show that it is well-fitted by a power law of photon index 1.6, similar to that of other Seyferts, and a large additional soft component. The X-ray luminosity over the observed band exceeds 4×1044erg s-1. A single-temperature blackbody fit to the soft X-rays and the short-wavelength ultraviolet continuum gives a luminosity of 2×1046erg s-1 while an accretion disc spectrum fitted to the same points gives a luminosity of 4.3×1045erg s-1. The flux measured by both the EXOSAT low- and medium-energy instruments exhibits 12 per cent amplitude variability on a time-scale of one day.

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