X-RAY OUTBURST OF THE PECULIAR SEYFERT GALAXY IC 3599

Details X-RAY OUTBURST OF THE PECULIAR SEYFERT GALAXY IC 3599 X-RAY OUTBURST OF THE PECULIAR SEYFERT GALAXY IC 3599

1995-05-18

arxiv.org/abs/astro-ph/9505085v1

Astronomy and Astrophysics

Astrophysics

4 pages, compressed PostScript, Letter accepted by Astron. & Astrophys., also avalailable on the web (http://www.uni-sw.gwdg

Scientific paper

We report optical, soft X-ray, and UV observations of the peculiar Seyfert galaxy IC 3599 using data obtained with ROSAT and IUE. Most remarkably, we discovered a rapid decrease of the X-ray flux by a factor of about 100 within one year and a more gradual decrease thereafter. The X-ray spectrum of IC 3599 was soft at flux maximum and became even softer as the flux decreased. Simultaneously with the late decrease of the X-ray flux, we observed a decrease in the strength of highly ionized optical iron lines. We discuss several explanations for this behaviour including an accretion disk instability and tidal disruption of a star orbiting a central massive black hole.

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