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GX17+2: X-ray spectral and timing behaviour of a bursting Z source

van Paradijs, J.; van der Klis, M.; Lewin, W. H. G. +2 more

We have investigated the properties of the Z pattern of the low-mass X-ray binary GX17+2 in the X-ray colour-colour diagrams (CDs) and hardness-intensity diagrams (HIDs), and of the power spectra as a function of position in the Z. We used all EXOSAT ME data on GX17+2, a total of six observations during 1983-86. We find that the Z pattern in the C…

Testing the X-ray variability of active galactic nuclei with the non-linear prediction method

Czerny, Bozena; Lehto, Harry J.

The analysis of eight EXOSAT X-ray light curves of six active galactic nuclei by non-linear prediction methods indicates that the observed variability is truly stochastic and is not caused by deterministic chaos. This result favours X-ray emission models with multiple centres of production of hot, possibly relativistic, electrons.