Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-12-05
Astronomy and Astrophysics
Astrophysics
17 pages (including 7 Figures), accepted for in A&A (main journal), also available at http://www.xray.mpe.mpg.de/~dgrupe/resea
Scientific paper
10.1051/0004-6361:20000429
We present ROSAT All-Sky Survey and ROSAT pointed observations (PSPC and HRI) of a complete sample of 113 bright soft X-ray AGN selected from the ROSAT Bright Source Catalog. We compare these observations in order to search for extreme cases of flux and spectral X-ray variability - X-ray transient AGN. Three definite transients and one transient candidate are found. The other sources show amplitude variations typically by factors of 2-3 on timescales of years. We found that the variability strength on timescales of days is a function of the steepness of the X-ray spectrum: steeper X-ray objects show stronger variability than flat X-ray spectrum sources. We also present new HRI measurements of our extreme X-ray transients IC 3599 and WPVS007. We discuss possible models to explain the X-ray transience and the variabilities observed in the non-transient sources.
Beuermann Klaus
Grupe Dirk
Thomas Hans-Christoph
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