The X-ray Variability Properties of PG Quasars: XMM-Newton Results

Astronomy and Astrophysics – Astrophysics

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Scientific paper

This paper presents preliminary results of a systematic study of the X-ray spectral variability of PG quasars with XMM-Newton. We concentrate on those objects whose X-ray spectra are well fit in the framework of the ``double-Comptonization'' model. On short (Δ t ˜ 10^3 s) timescales, variability between the soft (E < 2 keV) and the hard (E > 2 keV) bands is uncorrelated. In the two objects, for which observations at different epochs are available, spectral variability in the soft X-ray regime is found. Its timescale is constrained in the range between ˜1 week and ˜1 year.

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