Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.224..443p&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 224, Jan. 15, 1987, p. 443-452.
Astronomy and Astrophysics
Astronomy
72
Accretion Disks, Astronomical Spectroscopy, Black Holes (Astronomy), Seyfert Galaxies, Spaceborne Astronomy, X Ray Spectra, Astronomical Models, Exosat Satellite, Radiation Pressure, Variability
Scientific paper
Exosat observations of Mkn 335 reveal a hard power-law spectrum above about 1 keV, typical for Seyfert 1 galaxies, but with unusually strong variability on time-scales of about 1-2 hr. In addition, an intense soft X-ray component is found to dominate the overall spectrum of Mkn 335 below about 0.6 keV. Both soft and hard components increased in strength by a factor about 6 between 1983 November and 1984 December. These observations are discussed in terms of models in which an accretion disc feeds a central massive black hole. It is found that radiation pressure only allows a thermal origin for the soft X-radiation if the black hole mass is less than about 10 to the 7th solar masses, as suggested also by the observed variability time-scale.
Czerny Bozena
King Andrew R.
Pounds Kenneth A.
Stanger V. J.
Turner Tracey Jane
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