Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aspc..360..123g&link_type=abstract
AGN Variability from X-Rays to Radio Waves ASP Conference Series, Vol. 360, Proceedings of the conference held 14-16 June, 2004
Astronomy and Astrophysics
Astrophysics
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.
Guainazzi Matteo
Jimenez-Bailon Elena
Piconcelli Enrico
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