Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rftu.proc..429b&link_type=abstract
International Conference on X-ray Astronomy and Astrophysics: Röntgenstrahlung from the Universe, p. 429 - 430
Astronomy and Astrophysics
Astrophysics
1
Active Galactic Nuclei: X-Ray Bursts, Active Galactic Nuclei: X Rays
Scientific paper
The authors report on ROSAT PSPC, ROSAT WFC and optical observations of the ultrasoft AGN Zwicky 159.034 (IC 3599, RE J1237+264). They have discovered a drop in the PSPC band X-ray flux from this object by a factor of about 70 in one year. They also see a more gradual decline in X-ray flux after this time. Optical spectra show the dramatic response of the permitted line region lines to the change in X-ray flux. There appears to be significantly more flux in a soft X-ray component than in any expected hard tail, suggesting that the soft X-ray flux probably cannot arise via isotropic reprocessing of the hard X-ray tail. The authors discuss explanations for what might have happened to cause the X-ray outburst including the tidal disruption of a star by a massive black hole and an accretion disc instability.
Brandt Wiliam N.
Fabian Andrea C.
Fink Henner
Pounds Kenneth A.
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